I was pretty much in the same boat as you, after I graduated from high school I got extremely lazy and out of shape. I gained close to 45 pounds before I decided to hit the gym. I messed around with high rep/low weight training with mild success for a few months, but I didn't feel great about my training until I started using a 5x5 routine (recommended by Purenatural). For each lift, use a set weight and do 5 sets of 5 reps. It is important that you do not change the weight throughout the sets. You should use enough weight that you struggle on your 5th rep. Rest for about 60-90 seconds before you do your next set. Each week attempt to add 5 pounds to each of your lifts. You should see great results in strength if you progressively add weight in this manner. I just hit my 6th week using this program and I'm loving it so far.
Focus on your big compound lifts. Squats, deadlifts, benchpress etc.
Example:
Monday:
Deadlifts
Bent Over Barbell Rows
Wide Grip Chins
Wednesday:
Flat Barbell Benchpress
Weighted Dips
Military Press
Friday:
Squats
Stiff Legged Deadlifts
Calf Press
If you're training for football, you could possibly add Cleans to either your back or leg day. Cleans would help to promote that "explosiveness" needed for a demanding position like linebacker.
Tuesday and Thursday I use for abs. I generally train them with weighted exercises in the 10-12 rep range. If you feel the need to, you can add some bicep isolation work on your deadlift day.
Also, since you're looking to drop a few pounds, find out exactly how many calories you need to consume. Use this link:
http://www.discussbodybuilding.com/How_Many_Calories_Do_You_Need_Calorie_Calculators_Includes_Quick_Spreadsheet_Too/m_45013/tm.htm Reduce your suggested calorie intake by 300-500, and add some cardio on Tuesdays, Thursdays and maybe on Saturdays. 30-40 minutes should be sufficient, especially if you're eating clean foods at 300-500 calories below your maintenance level.
I'm by no means an expert and I haven't been lifting for extremely long, but I thought I'd try giving some advice for once. Get some more suggestions and figure out what you want to do. I highly recommend this routine, but others may feel differently. Hopefully my post helped a bit.
Edit:
I almost forgot, you may want to look into some plyometrics to increase your agility. If you want to play linebacker, you're going to need to be in on a lot of tackles. Additionally, you'll be required to drop back into pass coverage. Speed and agility are very important in a position that demands you get to the ball on almost every play.
Concerning the smoking... I would highly recommend trying to quit. Your body will thank you for it and you will have a much easier time when doing cardio. Just my two cents.
<message edited by Nihil on Monday, December 04, 2006 12:59 AM>