A few questions.

   Greetings.

I've just started and I've some questions.
First of all does something like that :

work just as barbell bench press would? I'm training on something similiar, with a longer bench.
And is that sort of exercise all I really need to do?

ya a thing liek taht work almost like a bench basically, works the pertorals and shoulders, same as a normal bench press

are you only working your chest out
you should do all your body

im back, now get in line!!!!

Actually, I thought it would work on my whole body, more or less.
What do you suggest then?

un like normal bench presses that does not work out your stabilizer muslces because you arn't holding the weight youa re pushing against somthing does that make sense?

starting
124 pounds
11 bfp
5"7
15 years old

Current
147
10 bfp
5"8
18 years old

yeah this is true.  Using fix machines does not work out the stabilising muscle.  This is because no movement is allowed to sway side to side e.g. if one side if stronger then the other using free weights, then that side will push first.  It also means your working out both sides of the pecs more effectively. 

Whereas, with the fix machine, if you push more on one side, the other side doesn't have to compensate for this as the handles are fixed and both move at the same time (if this makes sense).

Using fix machines would be good for beginners and then move onto free weights if possible.

thanks

James

Then I'm wasting my time?

Hey,
Un update :
Here's my current program :
I work out 3 times a week - monday, wednesday and friday for about an hour.
1.Warmup for about 5 minutes (by the way, do you have any pointers on how to do it properly? How about this site : http://www.netfit.co.uk/stretching.htm ? )
2.Fixed Machine Press - currently 5 reps, 8 sets of 70 pounds (I do it like that : start with 5 reps, 7 reps next week and then 15 pounds more another week - both with this and leg press)
3. Rest for about 1 minute, then do the leg press - currently 220 pounds and 7 reps, 8 sets.
4. Rest for one minute and do 10 crunches on a bench that is upwards ( I hope you'll understand what I mean :) and then back to the bench press and so on.

I find it that I can gradually increase the weight, even if I couldn't lift it two weeks earlier.

And another thing : I keep my head up when doing the bench press, is that okay?

what about your arms, shoulder,back and calves
you should invest in some dumbells aswell
 
then you would be able to do a full workout

im back, now get in line!!!!

Well, which other excersises I should be doing then? I already find that I don't have time to rest and an hour goes by quick.
By the way, is the rest of my program okay?

well i would recomend 3 x 10 or 4 x 8   for your chest
2 min max rest in between sets and only do your chest and legs once a week so that they can rest
muscle is built while your resting not while your working out,more rest better gains.
 
here is a sample workout i would suggest
 
monday chest and biceps
tuesday rest
wednesday back and biceps
thursday rest
friday legs and shoulder
weekend off
 
for your chest do flat and incline
squats an there own are ok if like me you dont have big legs
 
for your shoulders i recomend military press lateral raises upright rows reverse flys
for your triceps overhead tricep extension kickbacks (if you have the equipment dips aswell)
back overhead pull overs dumbell rowbacks deadlifts ,i really think the gym is the best for your back its to hard to do at home you need the machines
 
hope that helps
 
 
                           

im back, now get in line!!!!

Okay, here's an idea of what a well rounded program can look like.
Monday- Chest
Flat bench, incline bench, decline bench
Tuesday- Legs
Squats, stiff leg deadlifts, calf raises
Wednesday- Shoulders, abs
Standing military press, side lateral raises, shrugs
Weighted crunches, hanging knee raises, cable crunches.
Thursday- Back
Deadlifts, bent over rows, pullups
Friday- Arms
Standing barbell curls, reverse curls, alternating dumbbell curls
Close grip bench press, triceps pressdowns, skullcrushers

you'll notice there are three exercises listed for each major muscle group- You should do three or four sets for each exercise. Rest two to three minutes between sets. the reason you're only working each muscle once a week is because muscle needs a lot of time to fully recover and rebuild- It's not just a matter of if you feel ready for another workout or not.
Also, for each exercise, you should use an amount of weight you can only do eight to ten reps with on your first set or so to make sure you're challenging your muscles.
Machines, as the other have said, aren't as good as free weights beceause you have to stabilize the free weights with more muscle- But that doesn't mean machines are useless. If that's what you've got to work with, fine- You'll still see nice results.

Well, thanks for all the help. There are some problems, however.
1. I can work out only 3 times a week.
2. The gym I'm using has rather limited choice of exercises (I'm alone there, however, which is a big plus)
3. Doesn't the fixed machine press work on the arms too?
4. I do not want to look like a bodybuilder :P

And just so you know, I'm following pointers given by Sean Nalewanyj - Anyone know him?

The bench machine will work parts of your arms, only to a certain extent. The triceps and delts will get a bit of a workout, but you'll still need something to hit your biceps if you want to have nice looking arms.
The routine that Gambitbullet posted has you working out just three days a week.
Which exercises does this gym have?
Never heard of Sean. What sort of pointers is he giving you?

Just Googled Sean- Very impressive!
Also surprised to see that Marc David interviewed him for freedomfly.net- I gotta check that site out more.
He's definitely an inspirational guy, and makes all the sense in the world with his advice- Plain and simple, no secrets, just common sense and hard work. So what advice of his are you following? Working out for three times a week, what else?