lag hand, live 2-5

[wutevahung]

i had about 1000 in front of me
villian had about 500

people on the table were loose/weak/passive, not tricky at all

villian is one of those loose/weak/passive players

i m on button with 34 suited, full table, 5 limpers to me and i raised just to mix it up, made it 25 to call, blinds folded and 4 outa 5 limpers called.

flop- k59 rainbow

villian (utg+1) checked and everyone else checked, i bet 80 wanted to take the pot down (maybe should ve bet more? but i figure since they were simple players, they probably would call if they have something, bet if they had a king, and fold if they have nothing), villian thought about it for 30 seconds and called everyone else folded.

turn- 6

villian checked, i bet 140 (same reason as above why i didnt make a pot size bet, but should i ve taken a free card? i thought that if i checked and i missed on the river it would be impossible for me to make him fold since my turn check would mean weak, so if i check that means i can only win by hitting my straight, so rather than to bluff on the river ( when he is more likely to call), i bluff now so it gave me two chances to win, i thought by being aggressive i can make him fold a lot of hands include top pair weak kicker, and i could fold if he raises all in, any thoughts?

thanks