Absolutely start basic. But I think you've already started with the default HUD or something like it.
To give you an idea, here's mine ATM(ever changing):
VPIP/PFR/Hands(obvious stats in every HUD)
Steal / Fold BB vs Steal / Limp-Fold (Preflop easy money stats)
3B / Fold vs 3B / 4B (How aggressive should I be?)
CB / Fold vs CB / Fold CB to Raise / Bet vs Missed CB (Postflop)
Some of my favorite non-standard stats that I have are the Limp-Fold and Bet vs Missed CB stats. Those two make me so many extras bb's. With limp fold, it's obvious if they have a high % that you make a raise and they fold, you get an extra bb. With Bet vs Missed CB, it tells
you how likely you'll be able to pull off your check-raise. All of the other stats are pretty self-explanatory.