Can someone who has had some success with getting friends to sign onto Area 51 proposals give me some suggestions on what I should include in an email to promote a proposal to friends.

I just sent an email off to one friend, but I think it was quite difficult. The things I tried to cover:

* How to sign on to the site and create an account (Using Facebook etc.)
* How to follow the proposal once the account has been created
* How the site creation flow works (follow -> commit -> beta -> release)
* The need for the user to vote on on-topic and off-topic questions as that is what is currently lacking from the proposal
* Something brief about Stack Exchange and the fact that I don't have any financial interest, i.e "this is not an advertisement or I make $10 for each referral".

I've been hesitating to send this email for the following reasons:

1. The site hasn't been built, so I need an email that would persuade someone to use a site that is not yet built
2. The process IMO is quite encompassing, compared to say signing on to Twitter. It's hard to explain the whole SE experience to someone who is an outsider e.g a non-programmer.

Your answer doesn't necessarily need to be a cut and paste solution, I appreciate discussion on my thoughts above.