Hi kmaa97
Don't bother hissing at the glider it doesn't work instead try blowing at her slowly as that usually stops them without hurting our scaring them. The hissing noise is supposed to b a sign of aggression.
I am glad you are concerned and are trying.
As for food you will need to feed it wombaroo. You can buy it as a powder online. You will also need mealworms which you can buy in a dry form. They need the protein so mealworms or boiled eggs or boiled chicken should work. You can try pea snaps, green beans, cucumber to change up the food. Too many pellets can be bad for a glider.
Try ski gloves our thick winter gloves if your worried about getting bit as I find it helps when handling new gliders. Also try not to restrain them as that can cause biting. They are a fidgety creature and prefer crawling all over you rather than petting in your hands.
Sorry but you can't stop the pooping and as far as I know you can't toilet train them I have 20 gliders and not managed. But if your glider has just woke don't take her out immediately as they usually poop when they have freshly woken up.