1. How much should I have bet on that turn?

2. If he would call the above bet, what would I be looking to do on the river?

This is helping me see my weaknesses - I just want to envision how this hand SHOULD have played out.

3. What makes you think he doesnt have a diamond at all?

And lastly,
Fnord,
What does NI Han mean? I'm a noob to a lot of this slang, but I want to learn to be a better player, so I need to know what that means.