Dont bluff in low stakes games. People love to call call call. They play passive. If they play aggressive they have a hand. In order to compete you have to have a hand as well. There are occasional maniacs that just bet/raise every single hand but those are the exception rather than the rule. You do not have to bluff EVER to win at these limits. Learn the basics at these limits, then learn to bluff at higher limits where people can fold hands.

Also in these low limit games a minreraise (from .40 to .70) is the sign of a monster and usually KK/AA sometimes something less but not very often which is why Ez said this looks like a monster from your opponent.