Since you want to grow big bass AND big bluegills, I'd suggest raising bluegills in your hatchery pond to start. You can kill two birds with one stone...grow lots of bluegills to feed bass and hand select your best-of-the-best bluegills to retain in your hatchery pond, feed intensively, have them grow quickly, and stock them into the fishing lake once they reach 6-8" That helps you keep from totally depending on recruitment of bluegills in the fishing lake to produce more generations of trophy bluegill beyond the first generation or two. Basically, you can selectively breed your bluegills in the hatchery pond and provide lots of forage fish at the same time. Plus, bluegills will be your biggest limiting factor, long term, with your spoken goals.