Sorry to be a bother but I just got TS4 and I saw that there are different instructions for installing CC and I'm confused.
Can someone explain to me how install CC in TS4? I've picked out some hair, clothes, some mods, Script, Tuning and XML I think? Not all the ones I picked out have install instructions but they do say what type of mod they are.

You extract the files and then cut and paste the file(s) into your Mods folder.

Windows XP: Documents and Settings\(Current User Account)\My Documents\Electronic Arts\The Sims 4\Mods\
Windows Vista/7/8/8.1: Users\(Current User Account)\Documents\Electronic Arts\The Sims 4\Mods\

If you don't have a Mods folder , you can just make one.

For what kinds of mods? Scripting, tuning, xml, CAS files? Or is it just like TS3 where everything is .package files in the mods folder?

• Sims 4 - Installing CC
  You appear to not have read our great guides to downloading and installing custom content for Sims 4.
  
  Game_Help:TS4_Custom_Content^wiki This link contains everything you've ever wanted to know about installing custom content.
  
  

No, is not like TS3. Some files go in the Mods folder, some are unzipped while some are not, and some go in Tray folder.

Thanks. I checked the Nav Bar under Help but there are no links for TS4 yet. I didn't know if there were guides or where to look.

The link listed sends you to the information you need.
There is a ton of information on this site as well as others about How to set up CC in the sims 4. You just need to search for it.

Yes, the Help for TS4 isn't linked in the nav bar yet.