For all your modding and mod organizing needs you MUST watch Gopher's videos. His tutorial are 100% necessary for safe, reliable modding. He explains SKSE (Skyrim Script Extender), Mod Organozer, ENB, Wrye Bash etc etc.
There are a lo of videos but I'm afraid you do need to watch as many as you can. All my future posts will take for granted that you've done this.
Gopher's Mod Organizer videos
Gopher's Beginner's Guide to Modding Skyrim
Gopher's Skyrim Tweaks and Fixes
Gopher's ENB mods
Other than these Gopher also does Mod reviews and lets plays these are great quality and I recommend them. You can see them all on his Youtube playlists.