I used to play cash, so my hand selection tends toward nitty side.
The best possible starting hands are: Set, Pairs, and drawing hand (flush and straight)
Set (Trips Or Three of a Kind): Best possible starting hand.
I raise, re-raise. I go crazy over them, but if I get resistance in further streets, I might slow down.
Big pairs: I would play them aggressively but not as aggressive as set. So, I'm not raising often, I want to see other street as cheaply as possible. I might raise it in late position though.
Small and medium pairs: Limp behind, and play more cautiously; unless you made a set or full-house.
Flush and straight draw: I play them as I would play set.
Flush: I play them as I would play small or medium pairs.
Straight: I would not even bother playing if the pot is raised. Only limped pot is where I play them.