Based upon a ton of research here and elsewhere, in mid-March I stocked my 0.4A pond dug last summer with the following:

200 BG 3-4"
100 HBG 3-4"
100 RES 3-4"
10lb FHM

I'm also supplement feeding Optimal Junior, and catching a few gills seven weeks after stocking, the Optimal is definitely helping growth! Found FHM eggs on the bottom of a floating piece of plywood yesterday, so recruitment is already underway. In the fall, I plan to stock 40 LMB.

You may scale up as you deem appropriate...

My water is also 'chocolate milk' with a lot of suspended clay; a drought last summer caused issues getting grass established but after seeding in early March I've got pretty good coverage all the way around with the exception of my banks. Yesterday I started the process of rip-rapping the bank in hopes that will help improve water clarity in the coming weeks and months.