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Raise pre to about 75 imo.
good bet on flop, you don't want villain to check back and take a free card there. I like the sizing too, there are a lot of draws that will see a turn.
Turn I think you can bet a little bigger. Whatever floated the flop should call here again. Ideally I think you want your flop bet sizing to set up for stacks on the turn with only 13bb.
River easy gii. I villain has flush so be it, they shouldn't have called 2 barrels with a draw.

As for sizings:
Pre raise to 75
Flop (150) 90-100
Turn (350) 215 and villain is all-in.

I haven't looked at spoiler yet

edit: just looked. lol.

Thank you =)

I'm a 3.5 player also so maybe wait until someone else posts

Raise pre, imo. This short, you want to be attacking limps frequently; possibly with both shove-over-limp range and raise limp NAI. KJo is a good hand to raise his limp NAI.
Leading flop is fine, unless your opponent is very often limp/stabbing. In which case, check/raise IMO would be better.
This flop hits limping range of an average opponent quite a lot. Middling hands either hit something, or they will often have a gutshot+overcard, or something along these lines. For your flop bet, I like the sizing.
Now, on the turn it is tricky. Having a read on whether he's likely to raise you with draws on the flop can make your bet sizing decision much easier here. If he still has draws in his range after flop flat, you should bet bigger; unless you expect him to spew over your underbet with whatever.
Jack is a great turn against a non-thinking player; since it is a bad card to barrel. Draws are still calling, ten doesn't believe in a jack, 55-99 usually are still calling(but rarely limp pre...although, they do lately, as part of limp/shove range), and 4x w/o any draw normally are folding at this point, but opponent dependent of course.

Overall, bet more on the turn, unless opponent is likely to spew as he did. That's mostly hit or miss, though; and this board hits average limping range well(idk about it) + there's straight draws, two flush draws, etc.

raise pre/call ai.

as played, gii on turn or check call river. its pretty rare that villain will call river shove with worse, but since more of his range should be bluffs check calling gives him a chance to continue. I think shoving turn is best though.