For QuickBooks Online, they can get a free access through our Intuit Education Program (IEP). They can apply and set up your account by visiting our website or sending an email to firstname.lastname@example.org.
Once registered, they will be given a complimentary license to QuickBooks Online Account. Your students on the other hand will be given a 12-month access to QuickBooks Online Plus. You can see more details about IEP in this article: Intuit Education Program.
Feel free to visit us again if you need more help once you have your QuickBooks setup. See you around!