I am not sure what kind of questions you will need to ask. All I know is that most medical professionals will probably recommend CIs for your child which should be your decision. If you dont feel comfortable with that and they push you into it by saying the window of opportunity for language development will close, it is not true because many deaf children acquire language through sign language and spoken language without CIs but according to many people who have experienced getting CIs say that developing spoken language is easier.
Since I am not a parent of a deaf child, I cant really tell you what's the best way to go but as a deaf person who grew up without sign language, in my opinion giving your child both spoken and sign language is probably the best avenue to take so your child can have the option of either going oral only, sign-only, or both which in many cases most tend to go with both.
Exposure to other deaf children especially those who sign would be beneficial so your child can know that there are other children like him and feel secure with his deafness instead of trying to be like his hearing peers.
Also, deaf role models are great if you have any deaf organizations in your area. You and your child will be welcome with open arms.
Just a heads up...if you decide to go the CI route, you may get criticism from those in the Deaf community. Ignore them..they do not represent the whole community.
If you decide not to go the CI route, you may get criticism from those in the medical field as my friend who has two deaf sons went through.
There are many of us who are deaf here...culturally Deaf, deaf, deaf with CIs, deaf who wear HAs and deaf who dont wear any listening devices, and late deafened people and most of us have lived fulfilling and happy lives.
Good luck!