Pool Equipment Help

Hi guys, I posted this yesterday but it was moved to a different section. Being I had limited replies I thought to try reposting it again today.

Hey guys,
I hate to bother you with a question that Im sure has been asked a million times.
Im getting confused with all the gpm, curves, thd, and flow rates.....
If someone could take a few minutes to look over what I have and direct me Id be extremely grateful.
I have a 21000 gallon free form pool 20x40 ish.
1 waterfall
2 skimmers
4 returns
4...

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