Hi, I'm really interested to work for you. I've been blogging for 4 years now, 1 year using blogger, 1 year using wordpress and 2 years in tumblr. Actually, I now own two active tumblr blogs, and I used a custom domain before for my tumblr blog, so I know how to setup one. I have knowledge in CSS and html too, and a little of php... I can give you the link of my tumblr blogs if you want. I can make a video tutorial for you :)