Welcome, but as said for everyone here, sorry you have to be here, but you will find a lot of support and also information from all of us that have been exactly where you are right now.
I have had 24 BCG washes, and so far, six years cancer free. I say "so far" because bladder cancer has a reputation of coming back.
You doctor will tell you what to expect, and for most side effects, frequent urination, to some burning etc., there is help to get over the side effects.
Drink plenty of water after the BCG, stay focused on the "big picture"and keep a positive attitude.
Good Luck, and please share your journey with us.
Nancy