some modding questions

[NST001NS001]

i have halo trial cause my compy got reformatted for some reason
just some questions
i know i sound like a n00b

1. how do you make vehicles fly?
2. how do you make the MC carry more than 4 of each grenade
3. how do you make the MC carry more than 2 weapons?
4. and how do you make nukes on HPC trial?

plz don't flame
i know how to mod decently
i just don't know how to do these