NLSH10: river vs fish

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.05/$0.1 No-Limit Hold'em (6 handed)

Known players:
[tg]SB$7.97:///////;BB (Hero)$12.09:///////;MP2$10.00:///////;MP3$7.83:///////;CO$20.31:///////;BU$13.62:///////;[/tg]

Preflop: Hero is BB with A:d, A:s.
MP2 folds, MP3 calls $0.10, CO calls $0.10, 2 folds, Hero raises to $0.60, MP3 calls $0.50, CO folds.

Flop: ($1.35) J:s, 6:d, 6:s (2 players)
Hero bets $1.00, MP3 calls $1.00.

Turn: ($3.35) 7:h (2 players)
Hero bets $2.40, MP3 calls $2.40.

River: ($8.15) J:c (2 players)
Hero bets $5.15, MP3 calls $3.83.

Final Pot: $17.13.

Villain is typical fish over 18 hands
45/0/0/0.0
2.0/-/25/33

First of all the reasoning behind my shove: I see him call flop and turn with a lot of pocketpairs and draws (even if the board is paired). However I don't want to c/f on the river because of good odds I will get when he decides to shove (24% equity needed to call EV=0). So I decide it's better to move in myself (there is a poker term for this situation, but I forgot).
I see him call some 7x, Ax, 99, TT

Second thing about the hand: I bet 2.40 into 3.35 on turn. Leaving 3.83 behind of his stack in a 8.15 pot... Is it better to move in on turn with an overbet? Is there some rule-of-thumb like if the stack-bet ratio is so much, it's better to move in straight away?

Tnx in advance.