Hi,
I didn't played many hands at the table but the BTN had bluff 2-3 times before this hand.
1st Question: Should I 3-bet preflop?
I didn't raised OTF, cause I don't want a worst K to fold and/or I saw Btn bluff so I want to give him the chance to bluff again.
2nd Question:Should I raise OTF?
Thank you for your time.

Mandatory squeeze pre.
As played pre better to flat flop and raise turn only indeed.
I think a 3bet pre-flop is going to do better than flat calling because of three things: AK is more than strong enough to justify that; It's not suited, so it's postflop playability is reduced. 5bb is a really big open raise, so by calling you're paying too much to see a flop and not having the betting lead.
Flop is so dry. I understand the check-call. I like the check-raise here against agressive players. Donkbet doesn't make any sense imo because you called pre.
Turn could be a bet. With a flat pre, check-call OTF and lead OTT (the Johnny Chan play) you indicate a lot of strength. Even if he raises you, I think you can call.
Check-raise also shows a lot of strength. On NL2 just don't check-call here again. The pot is big, you might as well just ship it here. If you call you'll be OOP OTR not knowing what do, bet or check, in a tough spot with no necessity.
That said, I think this hand was well played postflop. Pre I think a 3bet is better.