BuddyPress.org

@dubbelf – it’s no more technical than modifying your theme loops to exclude posts from various categories, and certainly less technical than restricting certain authors to specific categories.

At this stage the questions you are asking are not really BuddyPress support specific, more general WordPress considerations.

If you want someone to build / enhance your site for you, you can advertise on the Jobs Board: https://buddypress.org/community/groups/bp-jobs-board/

If you are going to modify the site yourself, you will have to get technical (PHP, HTML and some base WordPress theming knowledge).