Small Stakes No-Limit Hold'em

I am not a good poker player, and am trying to get better.  I have read both volumes, and am trying to incorporate the concepts into my game.  I'd like to describe a hand and get feedback on whether I correctly applied the concepts of commitment and REM, and if not, where I went wrong and/or what other things I should have been thinking about.

$1/$2 live 10-handed.  $200 effective stacks.  I am in the big blind with K/Q offsuit.  Several people limp to me, and I raise to $9.  Four callers, nobody reraises.  I conclude it is unlikely I am up against AA-10, and figure there are at least one or two people with small pairs or suited cards.  I do not think it is likely that I am up against AK/AQ, but decide I am willing to go broke to those hands if I hit top pair.  I decide if I hit top pair, I am committed unless there is an obvious flush that comes.  About $45 in pot.

Flop is Q J 2 with two clubs.  SB checks and I bet $30.  Two callers.  I am leery of any clubs. About $100 in pot. 

Turn is 6 of spades.  I bet $75.  One fold and one call.  About $250 in pot.

River is 9 of diamonds.  I shove.  SB thinks and thinks and thinks and calls with K-10.  I go broke to the straight.