Welcome my best bud.
As you go just ask away. I have not had to face your husband's cystectomy, thus there should be others that can give first hand experience. This web site does have some extra info as you move around
I have learned from my own bladder cancer and other serious surgeries, try to keep each issue as they come as a "one day at a time". Easier to say than do. An oncologist? I would leave that with your surgeon and team. It may depend on how what lymph nodes reveal from surgery as everyone's cases are different.
The good news is you are the way to attack this disease. Hoping for the very best!