Kegel has quite a few patterns that are essentially house patterns but they vary in length. If the league isn't using sport it will probably use these. Here's a link to where they can be found. Kegal also has a group of challenge patterns, which are between their recreational and sport patterns in difficulty, but closer to sport. These can be found here. Even if he uses the more difficult patterns I'm assuming this is a handicap league and you'll be able to compete with the better bowlers without a problem.
Joining the league would be great experience. It would teach you how to bowl on varying lane conditions and you'd learn how the ball reacts to these conditions. I wouldn't worry at all about having a low average.
The Peterson point system is explained on this thread.
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