Experience playing Heads-up in the Poker card game:

When playing MMT and reaching the final stage, what will you do in 1vs1 situations:
1- How much bet-sizing in Pre-flop/Flop/Turn/River?
2- Should you always call flat on BTN (you always have at least 25% equity)
3- Hit Top-pair on the Flop
4- Should you slowplay on strong hands (AA,KK,QQ)
5- Should you bluff on Turn or River?

1. It depends
2. It depends
3. It depends
4. It depends
5. It depends

Those questions require books to answer.

1. 30% be enough
2. You can play almost with all hands
3. It is depends on what will fall out on the table
4. Yes you should stopplay with strong hand
5. Yes you can bluff on the turn and river
Good luck

This is such a hard question without more info.

A lot of how you play depends on the villan and the stack depth.

There is a big difference between playing hu with 300bb stacks and playing hu with 8bbs.

Being one of the final two players in an MTT is no different than playing HU (Heads-up). There are plenty of resources to study this game. Stack depth is one of the most important factors here, but so is player type and other things.