Ty -- If it was me, I'd stock all three the first year (I'm assuming that we are talking fingerlings). Yes, there will be some mortality and some will eat each other. However, if we have 50% survival on the fingerlng stockings over the first year, that would be just fine.
I want the LMB to reproduce as soon as possible. It's that first spawn of LMB that will really be the effective predators on the small bluegills. Again, remember that your LMB will not spawn until age 2, while the bluegill very likely will spawn at age 1. So, if you stock fingerling LMB and BLG in 2005, the bluegills will spawn in 2006, but the LMB will not spawn until 2007. Hopefully the walleyes and age-1 LMB combined will control the first spawn of bluegills. Then, the small LMB spawned in 2007 will go to town on that year's bluegill spawn.
Sounds like a great situation! 15 acres is a good amount of water!
Dave
Dave