1) since you're starting off, do a full body workout 3 days a week. Since your body is not used to lifting weights, and you're most likely out of shape, you will get some fast results, as long so work out properly.
When you get more strength start splitting it up, changing it from a full body workout3 days a week, to 4-5 days a week, and say:
Monday
-arms
-chest
-back
Tuesday
-legs
-abs
Thats just a simple example though....
I wait 2-3 min.. you have to make sure your heart rate doesn't slow down, or you will loose your pump, and will become tired faster.