Modify the login plugin on a BuddyPress site

I need someone with WordPress skills and BuddyPress / Cbox experience to modify a login plugin please.

I would like to keep a user logged in once they have entered the first set of registration details on the home page (or registration page) and to prompt the user to fill out their full profile by automatically re-driecting them to their profile page (upon completion of the first set of registration details).

Once they have completed their profile I would like this to re-direct them to the welcome page.

All these pages and forms are set up already it's just a matter of keeping them logged in upon registration and directing them to the correct pages!

I use gravity forms and gravity form user registration plugin

I will talk you through on a live demo of what i'd like using skype

There is a test version of the site availible also

Then if possible I'd also like you to put the existing facebook login button so it appears additionally on the home page

Thanks
Alison