In terms of this the game is certainly still lacking in options.
As a very lacking answer to your question... what I'm doing with a mate is just fly to the same area (sometimes difficult enough), set up a meeting point (usually resource extraction point) - keep in touch (because you might drop at very different spots) and then try and keep an eye on each other and shoot the same bounties. I've been playing a bit longer (and more often) so I'm still ahead of my mate in terms of ship and guns, so I usually help by softening up a target for him and then let him take the final blow. If two pilots are similar I imagine you can do this in turns.
You'll just have to keep an eye on the radar, it might not be easy at start but after a while you become pretty proficient at it and you can keep track of each other's movements pretty easily.
(I did have to reset my HUD colours to the original, because I felt it was a bit clearer)
It's not ideal, altho it's also kinda cool having to do it the hard way - I mean, no hand holding is fine with me and maybe 2 ships interdicting together would cause problems for other players.
That said, pirating with two is fairly cool. Get one to soften up the target and drop cargo, distract security and your mate can pick up the cargo in peace. And if you find something you can't handle on your own, well, there's more of you!
I was gonna make a thread asking about upcoming features (if any) with regards to group play myself, but seeing this I'll keep it here... Does anybody know if there is anything planned with regards to this?