Google search: InDesign table of contents tutorial
Oh, and don't forget to choose Help > InDesign Help.
You might also want to read the help files...
What, exactly do you mean by "interactive" table of contents, though?
Will do a search soon
What I mean by interactive is, when you export as an interactive PDF I want to be able to click on a sub heading and the PDF takes u too the exact page number
That shouldn't be a problem. You can set up the TOC to include PDF Bookmarks.