Wow- check out the Excercise science catagory of threads.
Like mentioned earlier,.. you'll get more reading up on them then having your questions answered.
But, realize that there is an order or inportance, and DIET is at the TOP!!
If your diet is failing you,.. it doesnt matter what you do in the gym (other then aid in fatloss perhaps).
Not to sound like an ass, I really dont mean to,. its just,.. your basicly asking for an introduction to bodybuilding it seems. And that can be a very extensive subject. Get the basics, follow the basics. Look at your diet now, read some information and then figure out what your goals are. Custimize your diet to meet those goals.
THEN, find you a simple routine you can do in the gym that involves compound movements (you'll find what these are in the threads. pick up a muscle anf fittness mag for some pictures if needed)
for the First few months, that basic routine your following should suffice, (along with your diet) allowing you to learn the about things in a little more detail.
Beleive me, .. knowlage is KEY. -you can train and think your doing things correctly for years, and wonder why your not making any gains.
Doing things correctly/smarter will yeild more noticable results, in shorter time, and give you a foundation to work with.
Start soon, LEARN the basics,.. BE CONSISTANT,.. and this summer could be entirely different then what your used to :twisted: