congrats cm, you've come a long way. 3 acres and 28 ft depths sounds awesome.
what are yer pond goals? i'll let others chime in on stocking rates, but here's a couple pics from my puddle to help enlighten you on the different lepomis species...
Redear (RES)



normal Bluegill (BG) (not to be confused with Condello strain BG (CSBG) or Gallus strain BG (GSBG)
female

male

and the best fish you could possibly put in the pond, especially if yer goals include BIG LMB

Green Sunfish (GSF)
youngin

oldun

here's a couple pics from others of some trophy fish to help w/ yer ID skills:
a beautiful coppernose BG

a real trophy......3 lb RES

hybrid BG are a whole nother story, i would stick with pure species but again that depends on the pond goals..
some may warn you about not stocking GSF, but i know first hand, bass love em...and they wont last long w/ BG and bass around, and IMO they will help jump start any bass pond......ok, shoot it down guys
good luck cm..