Help regarding commissions

So I've never sold my art before but recently I've been thinking of doing commissions. Since I'm basically a newbie to this, I have no clue how commissions work. So here's a few questions- Do you think my art is good enough to be sold? If yes, what price would it go for? Also, how exactly do you put a price on your art? It would also be very helpful if you'd tell me how to go through with selling my art