I've heard a few people over the past few weeks on not sure what to do, or its overwhelming, and where the hell do I start.
I thought if we have a thread on what you're struggling on then maybe people who are out there on the game more often can give some advice.
Regardless of what specifically you are lost on e.g. quests, way to play, bounties, etc. I would argue the first thing to do when you jump back in is do the Invitation quest from the Sweeper Bot. Within 30 minutes you'll eventually have 690 Power Level minimum (doesn't matter if its blues) which allows you to go into other activities at a good advantage.
Think about what you wanna do in the game too - gain weapons, obtain exotics, get catalysts for exotics, do challenging missions, do endgame activities, get armour, etc. That way we can kinda help you know what could be a starting point.
Let's hear what you wanna know.