New to Destiny, need help, suggestions, etc.

I'm new to this game, just started playing today. I guess people want the referral rewards? I don't even know the logistic of this game. How do you even finish a quest, let alone join a game. All I know is go to orbit, pick a planet and play one of the events then wait for people to join my game. I'm lvl 26 because I used some kind of light thing from the post master.....didn't know what I was doing. Anyhow, anyone interested in helping me out just let me know! Thanks!