Racker,
If you are planning to primarily target largemouth, spotted or smallmouth bass, I hope you don't plan to limit yourself only to Beaver. There are times when winning tournament weights can be as low as 8-9 pounds, and I'm talking about two-man team derbies with guys who know the lake better than I know my backyard. A good day of bass fishing on Beaver is 10-12 fish total, with maybe half being tournament keepers (15 inches for LM and SM, 12 inches for spots). Recreationally, the size limit on spots has been removed.
As the guys pointed out above, there are plenty of white bass and stripers to be had, if you're into trolling. You can also catch them by casting at certain times of the year.
Crappie fishing is by far best in the very upper White and War Eagle river arms, where the stripers aren't often found.
There's definitely a growing population of walleye, which others can tell you how to catch better than I can.
If you are serious about bass fishing, look north/east to Table Rock Lake. It's one the country's best bass fisheries and is quite a bit larger than Beaver.