Tutorial to kick me up to level 2.
Challenges - unlock EVERYTHING.
Multiplayer Campaign, start at the beginning and just go.
Forgot about the tutorial. Yup, I will do that first.
Second, I will do at least the level 1 Challenges, and perhaps also the level 2. My understanding is that those will unlock all additional weapons/accessories (level 3 only unlocks additional clothes), and that is enough for me.
Third, I will start the campaign, probably the Resistance first. For some reason I think the revolution begins there so I want to play it first, even though I am really more of a Security type of guy.