[droolie]

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If you bet the flop and get called in one spot (probably against some small pp), do you check the turn on a blank (that doesn't help flush nor straight draws)? or do you bet again? if you check and he bets, then is it a clear fold?

I'm having huge problems with this also in my 1/2 games at party..

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This is the 100,000,000 question. There are many variables to consider...
Being OOP sucks in these situations.

Look at the board texture. Could he be chasing a draw? If so he will fold if the river if the obvious draws don't come through.
What do you know about the guy? Will he always bet if checked to or only if he has a hand? (not everyone bets when checked to!!) Does he often peel one off? If so a turn bet might chase him away. If he's a calling station who calls down with any kind of piece of the flop you know you're in trouble. If he's usually aggressive and now is only calling he's probably drawing.

How much money is in the pot? You have to consider what the odds are. You will often be betting 1BB to win 8 or more. This is often a good gamble HU. The bigger the bigger the pot the more likely he's chasing.

You will usually want to see the river so you need to ask yourself if you want to call a raise or not. If you want to see the river but don't want to pay 2 bets checking is probably better. If you don't mind calling a raise just bet. If you can safely fold to a raise just bet.