pro-site and membership

when a user signs up for or upgrades to a pro-site i want to assign them to a membership level reserved for site owners. i can not find any way to do this at signup time. the only thing i can see to do is manually set them after the fact.

Since they are now paying for a pro site i want their membership subscription to be empty so there is no charge for the membership and the membership level to be set "pro site member" this level is reserve for pro site. in my case the pro site member is called "News Site Member"

any ideas

Also during the membership signup for a News Site Membership (pro-site) i need the system to go to the pro site signup. is there a function i can use to tie these together.

in short need information on ways to make these to plugins work together.