help please!

I'm looking to increase my size!!! I have been lifting for six months and am getting good increases... I eat heathly(lots and lots of chicken and tuna) , lift right, and get plenty of sleep. How can I get bigger? Should I do less reps and more weight or what?
 
I'm 6'1" pretty thin
Max Bench 205
Incline 145
curls 30lbs
shoulder press 60lbs
skull crushers 70lbs
thats just some of the main workouts and lbs i can do

The general rule is..
 
To gain strenth.. 4-6 reps last set 4th rep being at failure.. "with good form"
 
To gain size 8-10 reps, for example.. Flat BB bench. 4 sets at 12,10,8,8  Keep in mind that the same rule applys, the last set the 8th rep should be the most you can do with good form. 
 
hope this helps.

There is never enough time to do everything, but there is always enough time to do the most important thing

 

In general 1-5 reps are good for strength with some hypertrophy and 6-12 for hypertrophy with some strength altho it will depend alot on the individual.

You do not have to train to failure to stimulate a muscle. Make the last rep hard, but you do not have to fail.

i thought it was 4-6 reps for  gaining mass im trying so hard to gain mass  , i usually go like , a weight that i can achieve 10 reps for the first set and increase every set until i can only do four , i thought lower reps (4-6) with heavier weights put on size.
i seem to be getting mixed messages
 

I think that's one of the biggest misunderstood terms in lifting.. Failure... When I use the word failure, I mean it like I said above.  Where the last push or pull is completed but with good form and you're not able to do another with proper form.  That to me is failure. 
 
Pushing a weight until you're eyes almost pop out and you're form is all wack usually doesn’t accomplish size or strength but only Injury..
 
1-5 or 4-6 reps... Strength
6-12 or 7-10 reps....Mass...
 
so if i'm going for strength and I do 6 reps instead of 5 I'm going to gain mass??? I think we're being just a little nitpicky.. I've seen so many different opinions on this and i was only speaking in general....
 
If someone isn't an experienced lifter I think doing 1-3 reps with heavy weight is only asking for injury.. That's just my opinion.. not trying to state fact..
 
I'm only making this statement from what I've seen.. 125 lbs 16 years olds, who have been lifting for 2 months and they're trying to bench 200lbs 2 times.. Arms trembling looking like they're about to have a stroke.. and then, usually due to bad form, too much weight.. Something pops and they're out of the gym for 6-8 weeks nursing an injury and not able to do anything..
 
I'm sure you'll soon find out if you post a few questions here, you'll get several answers with slightly different opinions..

There is never enough time to do everything, but there is always enough time to do the most important thing