I have never bowled a PBA regional, but I have bowled lots of PWBA events. The best advice I can offer comes in three flavors:
1. Check out ALL your equipment for authorized vendors - including wrist braces, tape, bags, etc. Make sure they are all pba approved, or you won't be allowed to use them.
2. Be SURE to understand the lane courtesy. A lot of bowlers get quite pissy when bowling badly, and they'll look for any excuse to jump down a newbie's throat.
3. Don't let 'em get into your head. In ADVANCE, assume no one is there to offer advice on lane conditions or equipment selection in order for you to outscore them. Of course, unless they're a best bud...
Have a great time, learn a lot, and bowl well!!!
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-- The way we see the problem is the problem.