Your stocking strategy is sound. Go with it.
Here's my opinion...
When you stock fingerling bluegills, they'll grow up in that environment and become conditioned to it. Plus, at 500 per acre, that's a good number to establish a significant food chain over a year. The fatheads will reproduce exponentially.
The only catch you might have is potential to have predator fish introduced inadvertently through the watershed.
By stocking 500 per acre, you have control over the numbers in the beginning, and providing a growing food chain that will support your fingerling bass when you stock them.
After a year, when you stock bass, bluegills aren't likely to eat them. They'll have plenty of fathead minnows for bluegills and bass to eat.
You have a good plan.
If you need a source of fish, Pond Boss has a number of vendors that can help.
