Having problem with the comma

[Huxley]

Here are a few phrases that i have a problem with. Having problem with the comma.
It is all dialoq phrases. (I will try to answer them first)

1." To be quite honest with you ( ) I'm a little nervous." (goes a comma)

2. "I just don't know what it is at the moment ( ) but trust me ( ) I'll find out." (confused about that one)

3."Once those cars get close ( ) does kids don't stand a chance."

___Can 'once' be a introductory phrases? If yes, then there should go a comma.

4. "Once everyone finds out about who you really are ( ) they'll want to hurt you." (if it's a intro phrase then yes.)

-having trouble with the 'than and then'-

5. "It's nothing more then/than a curse." (don't know)

6. " I wanted to win more then/than anything." (don't know)

7. Plus is there a comma after ( c'mon) ex: C'mon, let's go.

[Prezbucky]

Here's how I would write them:

To be quite honest with you, I'm a little (bit) nervous.

I just don't know what it is at the moment but, trust me, I'll find out.

Once those cars get close ( ) does kids don't stand a chance." (doesn't make sense... do you mean "those kids don't stand a chance"?)

Once everyone finds out about who you really are, they'll want to hurt you.

---

It's nothing more than a curse.

I wanted to win more than anything.

C'mon let's go vs. C'mon, let's go --- personal preference. I'd put a comma there if you want to show a pause between "C'mon" and "let's". If you think that there's a pause, add the comma.
_________________
Billie Jean is not my lover. Hee.

[Prezbucky]

you could also write it thusly:

Come on! Let's go!
_________________
Billie Jean is not my lover. Hee.