Butylated hydroxytoluene (BHT), also known as dibutylhydroxytoluene, is a lipophilic organic compound, chemically a derivative of phenol, that is useful for its antioxidant properties. European and U.S. regulations allow small amounts to be used as a food additive.
Like others have said, it depends... If you're doing sets of 8-12 reps with moderate weights, rest 60-90 seconds. if you're doing high weight low rep (3-5 reps), then rest 2 minutes And if you're doing real heavy stuff like squats, deadlifts, I'd recommend at least 3 minutes.
Reps is the number of times you lift the weight in a row, and sets is the number of times you do that. A safe bet for you would be to do 3 sets of 8-12 reps, with a minute and a half rest in between sets. As a girl, you don't have to worry about building prominent muscle. Most women have to work their butts off and/or take supplements to do that.