How Can I leave blogger if I want to make my own design?

I have a blogger account with my own custom domain, so I was wondering, Can I leave blogger so that I can make my own website design? I no longer like the design choices and was wondering if I can just get a designer to make me a design and use that one, without having blogger limitations. I signed up for my domain through blogger & Godaddy, so that is why I was wondering. And also, if I do get out of blogger, how do I manage my website (would it be google apps)? please let me know as detailed an explanation as you can, and Thanks.