Congrats on your new babies you will be getting. There isn't anything in particular you have to have other than a fleece pouch for them to sleep in but things you should have are:
Hanging and swinging toys ie ropes, rings, pouches, landing pads, just anything they can run and jump and play on. (best if fleece so their nails don't get hung in them). Personally I made mine out of fleece blankets and plastic sewing rings. You can order "cage sets" here and I found some really great ones on etsy.com. If you want other ideas, plastic chains and toys are great. Just be sure there are no stickers on them. Some people put doll houses and cars and such for foraging toys also.
Running wheel. Everyone here recommends the raptor or stealth wheels because they are made specifically for gliders without an axle that can harm their tail in. They also have nail trimmers in them to keep their nails from getting too long.
Kitchens are not necessarily required but do help your cage from getting too messy because they are messy lil boogers when they eat and what I've found is best thing about them is it keeps urine and poo out of their food.
Hanging water bottle is a must, be sure to keep fresh water at all times.
Stay away from heat rocks, pads, lights etc. they are warm blooded and with a cage mate and plenty of warm fleece pouches they should be fine. If they are in an area that stays cold or has a lot of drafts, you can use space heater outside the cage. Just be sure you never put wires in the cage.
Lights aren't necessary but a red light bulb will allow you to see in the cage but doesn't hurt their eyes.
Well, I hope this helped. Feel free to ask if you have other questions. And make sure you posts pics when you get all set up!