I didnt ask all I should have done at the time so it's a good idea to ask those that have been through it. Do you know what type yet - ie will it be keyhole or abdominal? That makes a difference to the recovery times. You could ask how long you will be in hospital, how long will you have a catheter in for and will this be removed prior to being sent home - mine was but I note that some ladies go home with it still in and it is removed later.
You can also ask about pain relief and post op care, ie when will you be expected to be up and moving about, how long the recovery time is expected to be and how quick will you get the results from the op.
When the time comes to go in I would advise that you take BIG pants (I got them in a size up as your tummy is swollen), nighties (I'm a PJ's girl but nighties are easier), peppermint tea (I drank loads post op and it really does help with the bloating and trapped wind which is very painful!) and lots to read, I wouldnt have been without my Kindle.
Wishing you lots of luck, it's not half as bad as you think it will be, honest!