Hi Kenny,
Welcome to Microsoft Community.
May I know if you have a teacher account with Microsoft Education Plan? Check the reference: Compare Office 365 Education Plans (microsoft.com)and What Office 365 business product or license do I have? - Office 365 (microsoft.com). If so, following suggestions may offer some help on your scenario.
To create a classroom for collaboration, just use Team and check the details in Create a class team in Microsoft Teams. Also, more introduction for functions in Team: Microsoft Teams: Online & Remote Classroom | Microsoft Education.
To share a link for the classroom, just send the link in the chat area. For the reference: Microsoft Teams: Online & Remote Classroom | Microsoft Education.
Besides, you can even assign more tasks for students with Class Notebook. For the reference: Use OneNote Class Notebook in Teams (microsoft.com)
Do let me know if there has something you need more suggestions and I will offer any further support.
Best Regards,
Mia