[Malachii]

I personally limp with nines and try to flop a set or an overpair... tens are my cutoff. If you raise, you're going to play the hand more aggressively since you're coming in from a position of strength... if you play well after the flop and have a good read on your opponents, raising is fine.

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If I do raise and an overcard comes or a scary board would the typical line be to bet/call a raise and check/fold the turn unimproved?

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This question is horribly generalized. What constitutes a scary board? Who's doing the raising? How big is the pot?
Could your opponent be raising for a free card on a draw? I think my basic line would be a stop and go if I got raised on the flop, but it's very read/situation dependant.