Chris,
Weigh and measure, then decide culling numbers and sizes. Evaluate, first, then decide. Lots of info about culling on this site.
Here's a brief chart of length/weight of largemouth bass. Compare your fish to this chart. Underweight fish, take out. Average or overweight fish, return. Don't take more than 30 pounds until you have learned more about your pond, and methods to use.
10" bass should weigh 10 oz.
12" is 12 oz.
14" is 1 lb. 7 oz.
16" is 2 lb. 4 oz.
18" is 3 lb. 4 oz.

Teach a man to grow fish...
He can teach to catch fish...