I think you should send your child to a kindergarten for deaf children. Later, you can send him to a deaf school. Your main goal should be learning him the sign language used in the country you lives in. If it's the US, it would be ASL. In the UK, it would be BSL. Maybe there are courses for parents, so they can learn sign language too. The reason he should learn sign language first is because of that's the easiest language to learn when you don't hear well. When he's old enough, he can learn reading and writing. Deaf people who've learned one written language are able to learn other written languages later.
I think the most important is learning him the sign language and written language used in the country you lives in first. That's what he need the most. With sign language, he can talk with other deaf people and with written languages, he can get access to information. You can still learn him other languages as well, but spoken languages would take longer time to learn because of his hearing and CI. Often deaf children need to hear a word more times than a hearing child to be able to learn it, because of they may not pick up words from conversations as easily.
When learning sign language on courses, pictures of the things are often shown. You can learn to associate the sign with the pictures you see and learn a few basic signs, until you've learned more of the language to the country you moved to. If you shows a picture to your child of a dog with text under and show him the sign, he would learn both the sign, spelling and what it means. You, as a parent, can learn both sign language and a spoken language at the same time relatively easily if you're around many people who knows the languages. Both of you can benefit from using a lot of pictures to more easily remember your target language.
Here are some examples on how pictures gets used in language learning: