Hey, welcome! That's awesome that you're planning and researching gliders now! :)
I have two gliders right now and they are an absolute joy. I love them so much and absolutely love talking about sugar gliders, so I hope you don't mind me leaving you a long response.
A cage for two sugar gliders should be at least 24 inches deep by 24 inches wide by 36 inches tall with 1/2 in wire spacing. This is the cage that I have here.
www.petco.com/shop/en/petcostore/product/prevue-hendryx-large-black-flight-bird-cage-1320068?cm_mmc=PSH-_-GGL-_-CAL-_-PME-_-PET-_-AQU-_-0-_-PM_GGL_FY20_SBU05_SH13_SmallAnimalBird%26ReptileSupplies_BirdSupplies_PLA-SMRT-_-0-_-0&gclid=CjwKCAiAm-2BBhANEiwAe7eyFFhJMXordt5gnOc8KDFgKDXUbqubdfLVaGCPfyLS_ACaVClwpv2sRhoCh2kQAvD_BwE&gclsrc=aw.ds
Sugar gliders are nocturnal, so they'll be asleep during the day while you're at school. You can take them in a bonding pouch (be sure to put a piece of apple in with them so that they can stay hydrated) and they'll just sleep. If they want to get out of their pouch, they'll let you know. Mine get up around 10pm and go to sleep around 6:30 AM.
If you're not able to bring them to school, they will be perfectly happy at home. They'll just be asleep all day while you're gone. If they're going to bite and fight each other, it's most likely that they would do that at night, when they're awake as opposed to doing it during the day when they're asleep.
Another thing to look into would be diet. Sugar gliders need a good staple diet other wise they can develop HPL (hind leg paralysis) which can be fatal if not treated. A staple diet will keep them much healthier. They should never be fed a diet only of pellets. I will add a link to good staple diets. I currently feed OHPW and previously fed TPG. Both are great diets, in my personal opinion.
info.petsugargliders.com/staple-diets/
If you like learning by video, there is a GREAT youtube channel called Sugar Glider Diaries that has a ton of info and fun videos. :)
If you have ANY other questions, don't hesitate to ask! :) Like I said, I love talking about gliders, so I'm more than happy to answer. :)