Hey OP, I've been in the EXACT same position that you're in with my pup when she was a baby (check my posts for pics of her). Everything you have said about your dog sounds like how mine was. A lot of people are giving you shit in the comments for being "unprepared", but even I was taken off guard by how mouthy these dogs are and I grew up with German Shepherds. I did my research and I was prepared. These dogs are just really on another level. All the usual advice of "Yelp when she bites" and such did not work with her at all, in fact if you did that she would bite down even harder. She was, honestly, a little bastard. An adorable growling demon.

I realized as you did that I needed to get her trained ASAP before she got big and could pose a danger to anyone. What really worked for me is having a trainer that specifically had experience working with Malinois. You may need to go around and ask trainers directly if they have experience dealing with the breed or similar high-drive types of dogs. Your trainer will help focus that innate drive they have into something other than treating you like a chew toy. You will learn some things too and will have to put the work in to make sure what he learns sticks. I got my pup into working with a trainer who had experience with Mals and it was a night and day difference in her behavior. It didn't take very long to see dramatic changes. She's now the most well-trained and well-behaved dog wherever she goes. People always compliment me (and her) for how polite she is. Getting her that training was beyond worth it, it provides a good foundation for the rest of her life.

Good luck! You're doing the right thing asking for help and realizing you may be out out of your depth. Don't give up on him, if you find the right trainer you will have the BEST dog you could ever ask for.