Flop raise is a bit silly as he has correct odds to call if he has anything except complete air. Either just call, or make the maximum raise.
Turn bet is kinda funny but against such a passive player it's probably good (if he does have a hand that beats you, it's likely to make him check the river).
On river I'd probably bet about 1/3 pot, you want to get called by flushes, but be able to fold if you get check-raised. But you would vary this size depending on your specific knowledge of the player.
Hopefully you were planning to make a large bet on a blank river