Redirecting after signup

I want to make some adjustment to the buddypress registration form. This is a list of items in need of adjustment:

1. Date fields. Plain ugly. 3 large dropdown fields. I want to shrink the sizes and place them on 1 row.

2. Secondly, I want to redirect members (after pressing the confirmation link in the email) to a page were they can complete to fill out the remaining field in their profile? Where can I find the codes for the custom fields, avatar upload etc?