Membership area of WP site

Hi,

I need some advice on setting up a membership area of my WP site. The site consists of static pages and some of these will contain links to files which contain info and are available for download. There will be different levels of membership and members should only be able to download info that is specific to their level of membership.

Can anyone provide any info or advice on the best way to go about this.

Thanks in advance.

Gary Thomson