Hi, Ramble!
Sorry for the delay!
As for the hud, the most basic STT stats are these:
VPIP/PFR/Steal/3bet/Total hands-first line
Cbet/fold to flop Cet/Agg f.-second line
These are all crucial, but if you really don't want to overwhelm yourself, you can just add the first one.
Once you get more comfortable, I suggest you also add fold vs Hero 3bet, 4bet stats, BB raise vs sb limp etc, etc.
As for your performance, the most important thing is be patient and give it some time. You need to get a good sample of games to get a relatively good idea of how you are doing. That would mean prolly at least 1k 9-man Sngs. The more the better ofc. And I wouldn't draw big conclusions from just 1k games. Check the EV graph as well. It's not gonna be extremely accurate on a short sample, but still gives you an idea.
Color Coding- it's your preference. I have it VPIP of over 30 to be green, so it indicates that the player is prolly very loose, steal stats I have them gray, so that I don't mistake em. Aggression stats such as 3bet/agg. factor/PFR, I have them red. But choose whatever suits you the most.