Flopped Flush in 77 6man how to get more chips?

[CoolWave]

Saw a Flop for cheep vs a guy who checks bb all day. Bet half pot when he raises me. what should i do to maximize profit
PokerStars Game #13371721572: Tournament #67348670, $70+$7 Hold'em No Limit - Level VI (100/200) - 2007/11/21 - 01:21:36 (ET)
Table '67348670 20' 6-max Seat #4 is the button
Seat 1: walker1 (8313 in chips)
Seat 2: plaorbplad (5145 in chips)
Seat 3: RtShrubber (8665 in chips)
Seat 4: ice_spider82 (5480 in chips)
Seat 5: BrandanZ (6885 in chips)
Seat 6: pnj1021 (5065 in chips)
BrandanZ: posts small blind 100
pnj1021: posts big blind 200
*** HOLE CARDS ***
Dealt to BrandanZ [3s 7s]
BrandanZ: calls 100
pnj1021: checks
*** FLOP *** [Js Ts 5s]
BrandanZ: bets 200
pnj1021: raises 400 to 600
BrandanZ: ???