CakeBatter -- Yes I weight train, have been for 24 years now, I was 28 when I started, do the math

... As a beginner you should start with compound exercises that work large muscle groups for 6-8 weeks or so. Compound exercises are exercises involving more than one joint and targeting more than one large muscle group, ex.: leg press or squats, chest press, barbell bent-over rows for back. Weight training with progressive greater resistance, has the most potential for lean body weight and raising your metabolism hours after you workout. Doing a full body workout 2-3x/week and start with 10-12 reps of each exercise doing each exercise 2-3 times which are called sets....Hope this helps, if you have more Qs just ask away...
Here's a good site :
Weight Training 101