I love my deaf frenchie! He's a HANDFUL... But the deaf part really shouldn't discourage you. It's really rather a relief to not have a dog respond to every single little noise that's made... Especially as we know frenchies can be over reactive!
Hand signals as mentioned above are so important. And it's actually pretty tough to train more than the basics IMO, but these are my first two dogs and one happens to be deaf. Persistence is key, and even if they only ever learn a few commands, hey, you taught your DEAF DOG commands and tricks! I think it's great!
It's really no different beyond using your hands instead of your words, and you need to take extra precaution to the other dogs towards the deaf pup, since they can't hear if they are being "warned" or "put in place" while they're playing... You also need extra precautions when walking them, especially off leash, because if they don't look at you, they aren't "listening", it's rather nerve wracking! Haha!
If you can take on another, and you think she'll be a good fit, give it a go! Titan's temperament is SO mellow compared to Isabelle! He wouldn't be the pup he is if he wasn't deaf... He still wrestles like a maniac frenchie, still talks and barks (even more so than Isabelle!), everything you love about a frenchie, minus noise reaction.
https://vimeo.com/135690015
See? Can't even tell he's deaf...
I'm jumping all over the place! Excuse my rambling.
If you have any specifics that I probably left out just tag me!

I've learned so much over these months of owning Titan! So I might have more to offer!