Soreness
CTYankee, don't worry too much about soreness. It will happen, and sometimes you'll play through it, but it doesn't have to adversely effect your play, except maybe in the very beginning when the soreness can be extreme until your body gets used to the weight training.
If you're about to play pool, and your muscles feel sore and tight, go on a brisk walk, enough to get your heart rate up, for 6-8 minutes, and then stretch your muscles, with long steady (no "bouncing") stretches, for about 12-15 seconds each stretch. It's important to get your blood flow up for a few minutes first, as stretching cold muscles is not an effective way to loosen them.
Once your muscles are stretched and loose, the soreness should not affect your play. If you sit still for a while and tighten back up, re-warm and re-stretch your muscles.
-Andrew