As someone who has played ED for a few hundred hours, if you've never played this, don't go in thinking it's going to be No Man's Sky or something. This is a game with lore and factions, but it's ultimately a game of the sort that is what you make of it. It's the Flight Sim of space, and Frontier has a legit astrophysicist on their payroll that has helped with things like planet generation.
When you feel like you've got the hang of things but don't know what else to do, find a community to join. Lots of communities have their own ongoing projects, like the Fuel Rats or the various hunts for Raxxla. Good luck out there, Commanders!