Default How to change Roms ?

Hi, i'm new to this, and i need a bit of your expertise.

Right now i have MiniCM7 2.1.7 last update from original poster : nobodyatall

And nAa kernel

What i have to do to change for another rom ? like Paul-xxx's rom ?

I have to wipe data/factory reset and then install like the first one i did, will wi fi work with paul's room ?

I want to change room because this one uses a lot of battery, even all day basically idling.

I turned it on 7:30 AM and now it's 17:43 and there's only 54% left ...

Thank you