Villain is 26/16 over 38 hands.

Party Poker - No Limit Hold'em Cash Game - $2/$4 Blinds - 6 Players - (LegoPoker HH Converter)

Hero (SB): $983.48
BB: $154.42
UTG: $458.00
MP: $178.40
CO: $362.10
BTN: $415.00

Preflop: Hero is dealt J K (6 Players)
UTG raises to $14.00, MP folds, CO calls $14.00, BTN folds, Hero calls $12.00, BB folds

Flop: ($46) 3 9 J (3 Players)
Hero checks, UTG bets $33.00, CO folds, Hero raises to $100.00, UTG calls $67.00

Turn: ($246) 3 (2 Players)
Hero checks, UTG checks

River: ($246) 6 (2 Players)
Hero checks, UTG bets $125.00, Hero ???

I call preflop because I have good implied odds if I hit a straight or flush.

I'm not sure how to play the flop. Should I just call or is the checkraise alright? I don't usually checkraise a hand this weak, but I didn't want him staying in the hand with crap.
What are the pros and cons of checkraising?
Is it better to just call? How do you react to a turn bet?

Once he's called my checkraise I know he has something. I don't really want to put anymore money in the pot. I check. If he bets now I'll fold, but he doesn't.

River is another fairly harmless card. At this point I want to make a $50 blocking bet into the $250 pot. If he raises I'll fold. Do you think the blocking bet is good? Or is it better to check call a bet by him?
He might not even make a bet with a wide range of his hands if I check and might just check it down. Also, by betting I get value from Jx (where x is not an Ace) and it is unlikely he bets Jx for value if I check to him.

If I make a blocking bet, he will probably only raise with a strong hand or as a bluff. Not that many players are capable of bluffraising the river though. I used to think I could bluff any blocking bet, but too many donks make that bet as a value bet and some good players may even make the blocking bet to induce a bluff, so it's hard to raise a $50 for him without a hand.

I thought about this hand for unusually long when I was going to sleep last night. I was annoyed that I didn't make the blocking bet and it inevitably cost me $75.

You'll be happy to know that I read a bit about blocking bets on 2p2 today and when I played later on in the evening I got some extra value from making the blocking bet. This bet was a 1/2 pot blocking bet though.