There are literally just a few things you should do when you start a blog on Blogger, that will set you up to have the most control should you decide to make the jump to WordPress. There are also a couple things that will just make you look a bit more professional should you choose to stay on Blogger.
-I say buy your domain through a third party site. There's nothing wrong with buying your url through Blogger. It just takes a bit more drilling to get to your nameservers should you chose to move to self hosted down the road. It just comes down to easier access to your nameservers.
-Run your feed through feedburner. Again, you have more control of your feed should you chose to move it.
-Always back up your Blogger blog. One of the biggest complaints I hear is that if you are on Blogger, Google owns your content since they host it. What if Google wakes up and turns off your blog. I don't want to get into that debate, but what I will say is just do regular back ups. That way you can always bring your site back should you need to. There are two kinds of back ups:
Export blog- is backing up your content. In my opinion this is the most important back up to do. I suggest saving this in a folder somewhere. I try to do it weekly.
Backup/restore-is your template style/design.
-One thing I always do with a Blogger design is hide the Blogger navbar. I just think it looks cleaner. You don't have to, but I like to.
-When I say utilize your pages...it really just means don't load up your sidebar. Everything on your blog doesn't need to be on the homepage. Figure out what is really important to you, and figure out what can go on another page. Be sure you have an about, contact, and depending on what kind of blogging you are doing, a disclosure page.
-I know not everyone can invest the money in a professional design. When you don't know which way to go...I say default back to the old design mantra KISS (Keep It Simple Stupid) Keep it simple, and maybe look to invest in a custom banner.
If you're going to BlogHer, stop by the Geed Bar and say "Hi"...and be sure to check out my work at NW Designs!