stay away from lots of tuna its not good for you loaded with nasty chemicals, also stay away from shakes, a small piece of steak every night is more than enough protien than your body needs, hit the weights hard, start at 2 sets of 15 reps, then do it till you cant go longer, then lower your weights about 5 pounds 10 if you need to and again start 2 sets at 15 reps till you cant do more and keep going lower and lower till your done, get a full membership so you can work chest, triceps, and legs one day, and the next work your biceps back, shoulders etc, never work the same muscles everyday rule of thumb is letting them rest 2 days after working out, i.e changing up what you do every time your in.... stay away from machines they work but free weights are your best friend for gaining muscle mass