members only area?

Hi There,

I want to be able to make a post that is only available to other members who have an account on wordpress. . how do i do this?

Alternatively i would like to know how I can provide some information to newly registered users - eg some text and a link. I am putting on an event, and want to entice potential users to sign up to an account, so they can get access to a coupon or a some cheaper tickets, than what is already offered on the website itself for non registered users.

Any suggestions how I can do this in the most effective and efficient way?

Many thanks!