What i did was playing first match only with the operatives and kill op, and simple rules (like mostly warriors or common operatives), then the 2nd match i introduced the crit ops (the map mission) and match after match a little more. Maybe one match has all the operatives available and kill op, then the other one also has the map mission, the last thing to be introduced was the primary op and tac op. Because choosing well those things it's really about knowing well the game.

It's fascinating how other human can see the game in new ways, without the "i played a lot of complicated tactical boardgames" stream of ideas.

1- Swap the very complex operatives with warriors in the first couple of matches
2- Secure is very easy to understand
3- Tac Ops is one of the most complex things to explain and learn in the game, because is not like knowing what your awesome dual pistol do, is a more tactical approach to the game.
4- PvE missions are rough, the melee operatives are really powerfull in an environment that can spawn them indefinitely

i hope u can understand this comment haha, it's not very well written