Web Designer, Wordpress Theme Fix

Hi, ive just registered my website and got a friend to install wordpress but I have since bought a wordpress theme for it and cant get it to work.

I dont know anything about wordpress or web design but someone said it was easy to manage but as yet i cant do it.

I need someone to fix the website or get the theme working and then to set it up with how I want it to look and then to add on there some ebooks I have bought and want to sell on there.

Thanks Kathy