As Spooky said, you'll get a whole gamut of responses. Some surgeons start their patients out on meds and supplements while they're still in the hospital and others don't want their patients taking anything - preferring to 'let' the pouch learn to function on its own. Personally, I think any surgeon who states that the pouch should learn to function on its own should be given a really good dose of flaming butt burn that lasts at least a week. I'll wager that surgeon would then change her/his tune.
If you think you need something then you should try one thing at a time and start with lower doses. If you're not getting the desired effect than up the dosage, change the medication or add fiber. If you launch right into all of them at the same time and you find that you're having problems you won't know which thing is causing it.
I don't think anyone has problems with probiotics other than gas. This can sometimes be alleviated by cutting back the dosage or just hanging in their for a while. Sometimes it take the gut a little time to get used to probiotics.