Ime and o, you have 3-4 hard years of battling ahead. You don't give up trying: you lose control, but you keep influence; and if you're wise (which I wasn't) you'll focus your efforts on helping him learn to control himself. You'll give consistent 'moral messages', because they shape the man he'll be, even if the boy he is seems to ignore you!
Imo you look for carrots not sticks. Most teens are foul for a while; but the ones who go badly off the rails do so because they can't see any reason not to. Teenagers are naturally pessimistic IME, and school is a miserable place for most of them... So you can help yours find positive purpose and motivation to live well, not badly.
You'll take all the help you can get, professional or otherwise; but there's almost none available, or your DS will be unlikely to meet the 'threshold' for it, so you have to learn to manage alone.
You need to (learn to) detach, and recognise that most of his foul behaviour is biological, not personal.
You have to pick your battles, ignore a lot of stuff you hate, but be clear about your 'bottom line'.
Most importantly, you need to look after yourself: do fun, pleasant, enjoyable things that will give you some strength and joy, and help you deal with the sh*t. It's not a luxury or indulgence to do this; it's a survival essential. If you don't, you will not cope well, you will be miserable, you may get ill... and you will unintentionally teach your son that even you don't think you're worth respecting...
Most of them do grow out of it, it seems. Mine has (and if you're interested, you can do an advanced search on my name to see how bad things got)... Your priorities are to keep them alive, out of jail and childless themselves... And beyond that, help them find a reason to get out of bed in the morning and live life... If they have that, the rest of it seems to fall into place...
Good luck!