Expect around 6+ BMs per day, although YMMV.
If you have good anal sphincter control now, and the pouch is built correctly, you should not have accidents. I have very very minor leakage, so I typically have a cotton ball btw my cheeks most times. I could probably do without it, I am just used to having it there.
when I eat the wrong foods, that produce gas or watery BMs, the urge to go becomes very strong as the pouch fills up, to the point that my only mission in life is to relieve myself.
Having experienced the alternative (albeit for only 13 weeks), I would still choose the pouch every single time!