Nice ideas in there Schatten, and welcome to a friendly place.
All you suggest above can be done without addons using OFP:resistance.
It's your mission, just go for it. No one has ever made your
when you have specific questions to ask, as in 'how do i...' post them in Editing/Scripting: General
. They are a friendly lot and will be eager to help. Don't think you're asking really dumb questions, we've all been there.
I would reccomend that you avoid addons for your first attempts, simply because, why bother? They are in no way necessary to make a 'good' mission. They can make a 'good' mission 'great', but you'll have enough to do!