This guy just sat down at the table, and this was his first hand. I'm wondering about my flop play in particular. Also, was this a correct call on the river?

PokerStars Game #1078732292: Hold'em Limit ($0.50/$1.00) - 2005/01/14 -
19:51:47 (ET)
Table 'Gutemberga' Seat #10 is the button
Seat 1: AnnounceTilt ($7 in chips)
Seat 2: bluehorn66 ($28.75 in chips)
Seat 3: mikaltima ($7.25 in chips)
Seat 4: wrmahaff ($6.50 in chips)
Seat 5: 5080 ($23 in chips)
Seat 6: TomKGB ($13.25 in chips)
Seat 8: Bubbagump ($31 in chips)
Seat 9: NoNo_k ($9 in chips)
Seat 10: ShadowGk ($33.25 in chips)
AnnounceTilt: posts small blind $0.25
bluehorn66: posts big blind $0.50
*** HOLE CARDS ***
Dealt to AnnounceTilt [Jh Jc]
mikaltima: folds
AnnounceTilt said, "Sb special"
wrmahaff: folds
5080: folds
TomKGB: folds
AnnounceTilt said, "lol"
Bubbagump: folds
NoNo_k: calls $0.50
AnnounceTilt said, "i hate SB"
ShadowGk: folds
AnnounceTilt: raises $0.50 to $1
bluehorn66: calls $0.50
NoNo_k: calls $0.50
*** FLOP *** [Js 4h As]
AnnounceTilt: checks
bluehorn66: checks
NoNo_k: bets $0.50
AnnounceTilt: calls $0.50
bluehorn66: calls $0.50
*** TURN *** [Js 4h As] [7s]
AnnounceTilt: bets $1
bluehorn66: calls $1
NoNo_k: calls $1
*** RIVER *** [Js 4h As 7s] [Td]
AnnounceTilt: bets $1
bluehorn66: raises $1 to $2
AnnounceTilt said, "i hope no flush"
NoNo_k: folds
AnnounceTilt: calls $1