Use the Bungie forums and either hop in to someone's LFG or make your own for raids and whatnot (though I think most things now have an automatic matchmaking system barring 6-man raids). I would volunteer to help you, but I lost interest before the Trials of Osiris came out (so, basically, right before the House of Wolves expansion) and I'm now hideously underleveled compared to the current light levels cap (40).

I can recommend a few people I know who still play that game religiously and are willing to run new players through raids for gear if you want.