Are you talking about lifting weights? because I think you are.

I'm guessing you're trying to build muscle. So most folks recommend the big lifts for new lifters like dead lifts, squats, pull downs, and bench pressing. The problem with these lifts is that dead lifts and squats could really mess you up if you don't do them right. However, squats and dead lifts work some of the biggest muscles in your body (glutes, quads, hamstrings, lats) so they are really an awesome way to build muscle quickly, but care must be taken so you don't hurt yourself.

As far as upper body goes do some rows and pull downs to work your upper back (because pullups are probably too difficult right now) and maybe some pushing stuff like push ups for your chest you probably don't have any business bench pressing until you can knock out a 10-20 push ups from your feet.

Since you're new don't work on the little muscles too much. It just wears you out and you don't get much accomplished. Plus the little muscles will get a little use when you're working the big muscle and you can always focus on the smaller muscles in a few months once you've gotten comfortable doing some of the other stuff.