1. I think lvl 5. To look for them:

(ps3 user)
start>action and traits (under 1st drop)>additional
under here appear the classes u have develop and unlocked cross skills
select that clases, skills appear on right side, check the box next to skill to assign it to space (visible in lower portion of that window); then assign to hotbar..

2. no sure but i think MEDICA just work c party members (protect only work with party members)

enjoy