Welcome back. :wave: Always good to find a lost sheep returning to the fold.
Now, OFPEC is an editing-related site, not a general OFP site, and since your queries are really general questions, rather than editing ones I'm afraid I'm going to have to lock this.
But before I do, here are some pointers.
The three big sites you need to know about are this one, the official forums at wwwflashpoint1985.com and ofp.info. The fourth is Opflashpoint.org.
For reviewed (and therefore functional and safe) Addons and Missions click the links at the top of this page.
To help manage your addons use
mod folders and
Kegetys OFP launcher, which makes life MUCH easier.
Hope that helps you get back on your way. If it starts to go wrong and you need technical support try the official forums or the Avon Lady's FAQ.
#Locked