Formmail and pointing two non-hosted domains to my site

Hello, I’m a newbie here.

I have two questions, and I searched the forums and couldn’t find answers.

#1. How do I use formmail with dreamhost? I just want to know, if my domain is what do I use for the formmail, and will I get an email with the form responses that is parsed and easy for me to read?

#2. I have two other domains with DreamHost. they are, and I don’t think they are hosted, just bought. Do I have to host the to have them redirected to my hosted domain?

thank you, linne