I regularly bluff when I miss my my draw's, but I'll always bet big.... In some times I shove in the river, but be carefull with some players especially in lower torunaments of 1$ a lot of players call with second pair no kicker
Reading opponents is something I need to improve on... I have no great advice on this but if somebody is betting a lot post flop then I reason they cannot be connecting this much and are surely bluffing
The other day i missed the flop and forced 4 people to fold with a half pot bet... I haven't really got any great brags for bluffing sorry !
You can find out. if the player raises preflop and you call and bets on flop then cheks on the turn and river then you can be 70% sure he was bluffing