Wow, Sandie, that is a lot of questions. I understand because I got my Indie pouch 16 years ago. I can't answer how it will be for you, but I can share some answers based on my own experience.
1. I very rarely have any leaking. If I am concerned it may happen...I simply wear half of a Carefree panty liner in my panties.
2. Once you get the bladder trained, the sleeping issue isn't so much of a problem. Part of that will be determined on how much you drink in the evenings. Usually, where I am now, I only get up once during the night.
3. How long it takes depends on how full the bladder is, and the size of the catheter. It does take a bit longer, but not that much.
4. You may wish to check with the doctor you are seeing now for a recommendation. I am lucky, because there are doctor's here that I can see.
5. If it is something I am going to wear to work all day, I avoid things that have strong elastic waist. I wear regular waist bands...much more comfortable for me than elastized. Other than that, I wear what I want.
6. I am glad I have the Indie pouch. Would not go back and change.
7. I didn't lose any weight, for a while, I gained. Then, I finally got back to normal.
I hope this helps. As I said, I can only reply based on my own experience.
Sylvia