the multiplayer is kinda ... well... complicated

so my question are:

1. What do i get when i reach a new rank?
2. What do i get when i reach a new module rank? (example: Stealth lvl 2)
3. What do i exactly* get when i complete a mission? (example: Kill 20 enemies in 8 seconds after leaving stealth mode)

* i know that i'll get some XP's but i'll also get something different (module point or something like that, is it for upgrading a specific "perk"? like "See your enemies in 15 meter lvl 2?"

bump.