Add-On Assistance Please: Admin Profiles, Gallery, Forum

Ok I'm literally ready to pull my hear out at this point. There are two things I want to add to my store and I know it can be done but I don't know how or where to do it. Those two things are:

Gallery
Forum

I've been to stores that have both of this but I don't know where to get the software and it's needs to be easy to install and easy to run after install. Am I asking for the impossible?

I also want to add the Admin_Profiles to my Admin area but every time I try I can't access my Admin section until I remove the files and reupload all the files I had in my admin area beforehand. Is there an Admin_Profles for Dummies book or can someone help me.