Hey all, I'm interested in getting back into the game for RoI, but I haven't played regularly since around October/November of last year (having gotten swept up in Fallout 4 and Halo 5). I played a game or two a few months ago and felt horribly behind. Any suggestions on what I should do to get myself back up to speed? Or will RoI sort of just be a "reset" like TTK and should I wait to start from there?

I think the best thing you can do for RoI is get your light level up to 310-320 at least. That is going to be your biggest hindrance. How you can do that... There are lots of ways, raids, Trials, Prison of Elders weekly challenges.. Pretty much any top tier challenges.