Alright, I am going to play as a female tribute from district 2 (masonry) and a male from district 6 (transportation) so my female will be a career tribute.
Up to you. We can start with them arriving at the Capitol, bit of interaction before the arena.
My female and your male would already be very friendly as they are career tributes and when they all mentor, of course they'd be mentoring the careers. Although they will all know each other.