Please checkout Home Learning Resources for a wealth of free resources for all age ranges.
Please check Google Classroom for Specific Assignments.
Your class teacher will set work on your class page of Google Classroom. Other work like Muisc and French will be set on the Year 3 class page.
If an assignment asks you to create a document then follow these steps:
1) click on create
2) choose the blue folder labelled Docs
3) Google will automatically save it so you can just close it when your are done. It will still be there.