How on earth do I do this?

Ok, so I want to do a fashion/lifestyle/travel/food/things I love BLOG.....but who knew how confusing it all would be?  I went through a service and had a blog "built" with wordpress with a nice, spiffy "theme" that I then had no idea what to do with!  I suppose I should just pay someone to set it up for me at this point, because I really don't have the time to educate myself and learn what would be a whole new language.  I've already bought the domain name I want to use and it's been set up through this service and it directs you to the wordpress site or I would just start completely over here.  I'm so confused.  Anyone have any experience like this?