Blog Fix for http://www.debt-free-christian.com/blog/

I need someone to help me fix my blog as I get an internal server error when I log in and try to update the existing post. I also need it updated to the latest version of WP and fixed so that automatic updates work properly. Lastly I want to change the background color design of the content section so that the posts are on a white background instead of the current gray. Please send me your best bids as I always leave excellent 10 feedback for a job done well.