Help Please!

I need a little help with this blog.

See, I'm still pretty new to the blogger.com program and haven't figured out where to go to do some of the stuff I have seen on other blogs. (Maybe it can't be done here.)

Anyway, I'm trying to figure out if there is a way to allow anyone to post comments, but still force them to provide basic information like an alias, a real name, and an email address before allowing them to post. Can that be done?

If it can't, I would really appreciate it if folks that aren't on blogger.com would create their own alias (or some other way of identifying to whom I'm responding) when posting anonymously.

Any suggestions (related to these issues) would be welcome. Thanks for your help!