You're going to need to install automatic feeders, at least a couple and ideally three or four, if you want big bluegill in the pond. Ideal stocking numbers for big bluegill/redear would be half the numbers listed above, but the numbers above are definitely better for producing trophy bass. If you go with the numbers above, especially if you stock threadfin, you won't get much bluegill growth without automatic feeders set to feed at least once and preferably twice a day. The bass will focus first on the threadfin, putting less pressure on the bluegill and giving them a better chance to overpopulate; and those numbers are starting off overpopulated. But the numbers are good for trophy bass. Just make sure you feed if you want good-sized bluegill. Fertilizing would also be a very good idea.
Lastly, waiting a year between stocking forage and stocking the bass is espoused and touted by some very experienced and knowledgeable pond managers on here, but there are also very experienced and knowledgeable pond managers on here who don't subscribe to the theory. Greg Grimes has managed multiple ponds in the South in which LMB grew three pounds a year and in which the bass were stocked at the same time as everything else. You definitely save money on forage waiting a year, as the idea is to have the pond brimming with forage by the time the bass are stocked; but the same thing can be accomplished by stocking more forage initially, and a year of time the bass could be in the pond growing is not lost.
Finally, if you stock that many bluegill, along with threadfin, in the pond and give them a year with no predators in the pond, you truly will have a pond overrun with forage by the time the bass are added, which will be great for the bass but you will have no chance of ever growing decent-sized bluegill because the pond will be severely overpopulated with them and shad. The bass will possibly be able to thin the shad out in a year or two, but with that kind of head start they'll never get a handle on the bluegill, which means your bluegill will grow zero outside of automatic feeding, and not much from that since that's intended to be supplemental and not their sole source of nourishment.
