If you play with only one person (others go fold), and you could tell he doesnt have anything, you can try him with pot. It is a risk, but sometimes bluff is the only option.
When you bluff a bet has to make sense. Your opponent needs to believe there is a reason that you bet, not just because you suddenly feel you want to take a sudden shot.
bluffing is an integral part of the game. I'm bluffing a lot. The amount depends on the bluffs style of play rivals, stack size, position, and so on.
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Good luck in the game and life
Im trying to bleff when i see ppl only checking after flop. For me it means they dont have good hands and they are trying to play on higher card u know. I can rise then and they will fold in that situation.