Jacck,
Although the previous posts do mean well. I'm affraid the advice you've gotten thus far isn't going to help you much.
Despite popular belief you can get ripped without being able to bench 400 lbs and squat 800 lbs.
As I explained in a post earlier today jumping to the weights isn't always the quickest way to Mr. Universe.
Here's the deal, your 16, and by your own words like a tooth pick. Though genetics don't play the largest role in your overall potential they will determine at least 20% of how you might turn out.
Chances are you're going to get taller, and I'm guessing you eat like a horse already cause you're a teen. Maybe not the best foods, but I doubt you have an eating dissorder.
Don't get me wrong, I have nothing against weightlifting. I did it from 8th grade through college, and I played in every league available at my school. Except for the Math League, but that doesn't count. I haven't power lifted in years and look and feel better than I ever did while playing college football.
So, first you need a goal. Would you rather look like Gerrard Butler (you know, THIS IS SPARTA) in 300 or one of the dudes from the World's Strongest Man competition (pulling a 18 wheeler) on ESPN classic. Both have their advantages and disadvantages. What you desire to be is the initial key. Get it?
You have to decide what you want, then you have to SERIOUSLY BELIEVE you can make it happen. If you can't do either of those, what ever you do physically in the gym, pool, yard, garage or where ever won't mean squat.
Now if you don't know what you want, try askin' that chica your trying to impress what she wants. Then, make that what you want. Okay, I digress....
Eating mega healthy isn't technically as important for you as it is for us old farts. But, your young and your mind's a sponge so listen up. Stop drinking mountain dew and red bull, toss the doritos and hoho's. If your anything like my best friend in high school you eat sugar like everyone else breaths air and don't gain a lb in the process. But I'm tellin' you now it will catch up to you. That rant asside, do yourself a favor now and ask your 'rents to hook you up with some quality grub. Skip the white breads and switch to wheats, same with the rice, white to brown. Try new stuff like quinoa. Pronounced "keenwa". They have it at the good grocery stores. Not the local Aldi. By the way, don't shop there. The hotdogs will turn your poo green. Bad juju. Start drinking water, not soda and juice. If you want juice eat the actual fruit, not something that was processed and put into a bottle. This is what I tell people that want to lose weight. In your case its to train you now, so you're not like them then. If that makes sense...
Wow this got long. Dude.
It sounded like in your original post that you wanted to get cut, not look like a cartoon, right? If that is the case. Figure out the max number of push-ups, pull ups, sit-ups and lunges you can do in a minute from the start. Go ahead, do it. Now. Write those numbers down. Multiply each one by 2 or 3 and that is your goal. Each of these exercises has a bazillion (yeah that's a lot) of variations that will single out and target different muscles and muscle groups. You're going to to have to work. Hard. I mean boot camp in Full Metal Jacket hard. So be ready.
Now before you start, 1) meet up with the chick your dig at the beach or something where she can see you with your shirt off. 2) Be prepared, she's probably not going to be impressed. 3) Have faith, eat right, do the work and repeat 1) to blow her mind.
Now I didn't write out a workout regimine for you, and at this point I'm affraid I can't. I don't know you, your condition, your strengths or weaknesses. For someone to truley give you the physical tools you need, they need all of those things. So take everything you get on forums with a grain of salt.
Lastly, make sure you don't have any heart conditions, or medical complications before you take my or anyone of the other wicked cool people's advice from this forum. If your serious, make "su madre" take you to the family doc for a physical first. Yeah, their creepy, but you gotta do it.
Anyway, you don't need luck. Just don't quit.
remember,
think good. eat right. work hard.
BC