Always make sure the last repetition is as pretty as the first. I can't tell you how many people lift weights without having their backs properly supported. If you are in a health club ask for help. Now that I've given you some friendly advice, find your current level of fitness from the 3 levels listed below. Individuals at Fitness Level 1 have not regularly participated in a strength training program and should begin slowly.
Form is critical.
Most experts in the field recommend beginning with 2 times per week, 20-30 minutes per session. Try to complete 1 set of 15-20 repetitions. Most experts in the field recommend working 3 times a week for 20-30 minutes a session. If you can fit all the major muscle groups in, that's great. Never work the same muscle group two days in a row because the muscles need at least 24 hours to recover.