Here's a quick answer to your first question: click the link that says 'Skins' at the top of this very page!

My, that's quite a list of questions you have there. What's your record for the most number of consecutive questions? <movie reference?>

B2e will generate your RSS in no less than 3 flavors. ATOM, too. Automatically. Aren't you glad you picked it? It even has electric leather seats.

I don't know about the MyYahoo or MyMSN feeds. You'll have to check those sites for that info. They'll most likely have instructions on their sites.

Pinging is having your site let others know when you submit a new entry. You can set your to blog ping the b2e site automatically in the back office. I *think* its on the advance tab of your blog's settings, but I'm going from memory. If you want to get the word out about your blog register with some sites like blogwise or... I know there are others, but the names escape me.

Welcome to B2e. If you're new to blogging, there's a lot of helpful info out on the web. Google & Yahoo have helped me immensely.