How loose should your early game BB / SB calls be?

Looking for some opinions, I'm in a tournament at the moment, and I've just be wondering what exactly the correct call is.

#1
first hand, on BB, hold = 78.
UTG min raises, 5 callers - me = ?
--> I chose to call, because for 20 chips with that many people, if i flop a str8 or set, i figure i can really milk someone good. Correct choice?

#2
First level still, on SB hold = 54
4 callers in front of me, limp in 15 chips to see flop?
--> I did.

The way I've been playing, if the hand is trash i.e. 29, 23, etc, I will not play it no matter what. If there are a LOT of n00b limpers, I will widen up and call more, thinking of implied odds, if the hand has some paint on it (i.e. K5) I will call the SB with not as many people in the pot.
Correct?