well i work out every other day and work out my entire body whenever i go....
but when ur working out try to trade off what muscles you do because if u work a muscle for too long u get stretch marks
not pretty... lol
so wut im saying is that if u work your arms one day, u might not want to go bicepts for and hour tricepts for an hour, forarms for and hour.. but maybe do like 30 min bicepts, then tricepts, then forarms, and then go back to bicepts and do it over again, this helps let your arms rest a little after working them hard (i am assuming) and also letting the blood escape from the muscles so they dont get too full of blood and stretch... this goes with your whole body, legs, shoulders, ect.
and like what he said, heavy weight at low reps = muscle growth light weight high reps = muscle tone... so once you like the size you are at, try to do light weights at high reps to tone your muscles and give them a better shape