BuddyPress.org

Have you tried using the BuddyPress Template Pack plugin with your existing WordPress theme?
https://wordpress.org/extend/plugins/bp-template-pack/

Follow the steps closely. You’ll probably need to tweak the CSS styles once you have the Template Pack plugin up and running.

A good CSS debugger is the Firefox plugin, Firebug:
http://www.getfirebug.com/

Also, if you need paid help, please post in the BuddyPress Job Board group:
https://buddypress.org/community/groups/bp-jobs-board/