New section/entry can't go live I've created a new section, with one entry. When I want to live preview the entry, the live preview button isn't there. 

I've read this is because my new section doesn't have an active template? How do I resolve this?

I'm very new to this!
Have you already made up an html template for this section?

If so you should check if you assigned it right.
Go to: Settings>Sections>(your new section you want to assign) and check the entry template. It should be something like (folder you made the html template in if there is any)/(name of file)

Without any written HTML its not possible to have a live preview as it doesn't output anything.

If thats alright could you post some pictures of your Folders and your back office?