All you have to do is ask, and you'll get a lot of good advice here. My first thought is you should be doing your Kegal exercises frequently. My docs lent me a tape that had a whole routine that I did. Also, do some exercising to get in shape. Walking is great, since that is what they'll want you to start right after surgery. I felt these helped me not have any issues with continence.
As far as immediately following surgery, one of the best things I had in my master bathroom was a chair to sit on by the toilet when I changed bags. I also had bleach to rinse the bag and baby wipes for cleanliness, making my bath look like a chem lab. My wife's old walker from an earlier surgery came in handy to hang the night bag from. Also, I purchased some basketball style sweat pants, with a zipper on the legs, which worked well with the leg bag. My only issue with the catheder was with the strips used to secure it to my thigh. (Some have used velcro straps.) I ran out of these, since I showered every day, and had to have a relative go pick some up.
After the catheder is removed, there are many variations of pads, underwear, etc., depending on your level of continence. I ended up putting almost all of the depends and large pads away for old age! I found that women's panty liners did the trick.
Good luck, and I'm sure there will be many more postings here with more ideas for you to consider.