What you're going through is completely normal. I promise, it will get better.
The opaque pouches are so much better. I use ones from Coloplast that have a velcro closure, which make it easy to empty.
I clean the end with toilet paper. It helps to use two wads of TP. Use one to lay the end of the pouch on, and then wipe it clean with the other.
The consistency of the output is always watery at first, but it will thicken over time.
To keep the wafer off the incision, cut the hole to the left or right of center, so when you put it on, it shifts away from your incision.
If you use adhesive remover wipes to remove your wafer, it won't hurt. You'll also want to shave the tiny hairs where the wafer goes, so it doesn't pull them out one by one each time you remove the wafer.
Eakin Seals are great at preventing leaks when you have watery output. You put one around the hole in the wafer, and it molds around your stoma. The convex wafer will help a lot.
That's weird that you haven't had any output in 31 hours. Are you still on pain meds? They can cause constipation. Make sure you're drinking plenty of water, and let your surgeon know if it continues.
Gas-X will help with the gas.
There is an adjustment period, but soon, this will all come naturally to you. Hang in there, you are doing great! Please keep us posted on how things are going.