I own a Rickenbacker 4003 (burgundyglo) from the early 80's that I have been keeping for when my son was old enough to learn. He plays Bari sax in the big band jazz band at his school and is ready to start lessons on the bass now. Its been over 30 years since I played the bass, so I need some advice. Which strings are recommended for a beginner? Also, which combo amp is recommended? I would like something that will be compact enough for him to practice at home, but that will also work for jazz performances or church performances. I'd like to keep the price under $500 for the amp. Thanks!