Wassup. Intentions of Hitting the gym maybe tomorrow but my thing is, I know NOTHING about lifting / body-building, or none of that. ANd I'd hate to walk into the gym and not know where to begin, so I'm here to ask about simple routines, tip and tricks and whatnot about how to start.

Im around 135-145 Lbs. Skinny. Not very fit at all. Can barely do a sit-up, pull up. But i'm determined. Any advice? I'm usually planning on going alone, since I have nobody to go with, but i'm desperate to get myself into shape as it may improve my quality of life.

At this point, my diet is NOT very healthy. Lots of McDonalds, Candy, Snacks, Soda. Although I have a high metabolism and barely gain any weight. I barely eat home-cooked meals.

Would supplements help? (Protein, Diets) How long should I stay? Lots of treadmills where i'll go, (PF) should I use them or just stick to lifting? Do I jump right into lifting? Or Start with some exercises? Things that may be crucial to someone starting?