Just want you guys' sense of what to do throughout this hand. I was new at the table and had no real read on any of them other than none seemed completely wacko. His call on the flop scared me into thinking he flopped two pair, yet I felt compelled to bet for value on the turn. Thanks.

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

BB ($9.25)
UTG ($10.30)
MP ($10.20)
Hero (CO) ($9.70)
Button ($9.35)
SB ($5.35)

Preflop: Hero is CO with J, A
1 fold, MP calls $0.10, Hero raises to $0.40, 1 fold, SB calls $0.35, 2 folds

Flop: ($1) A, 4, 8 (2 players)
SB checks, Hero bets $0.45, SB calls $0.45

Turn: ($1.90) 10 (2 players)
SB checks, Hero bets $1, SB calls $1

River: ($3.90) 9 (2 players)
SB checks, Hero checks

Total pot: $3.90 | Rake: $0.15