Hello idrc!
Two answers for you :
1. IS TOTALLY NORMAL for you to feel sore on the muscles to trained a few days before, especially if you just started lifting after some time.
2. If you are doing exercises without the help of a professional, is possible that you are doing your exercise the WRONG way... don't be afraid to ask! A lot of people don't actually know what they are doing.. weightlifting is an art.