WordPress for school, how?

At our school we teach at the tech. dept. third class we are thinking about using WordPress. Unfortunately we don’t know how to use it so taking a decision is hard. We hope someone can advice\help us in this matter.
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I the classroom we have multiple groups of 4 or 5 children. They have to make an assignment and document it every time they have class.

We as the teachers have to be able to reach all documentation and even change it if necessary. Students may change some but not all documentation. We must be able to close parts for change after grades have been given.

Some documentation how things work must be viewed by all as this will be there guideline in what to do and what we expect but this may not be edited.

Every lesson one of the students must write a report what they have done and what they are planning to do with text, pictures and movies may be entered. They have to be able to work partly from home. Groups my not edit other groups and a record must be made who has written a part of text or has uploaded a photo or movie.

As a student they must easily see in the software where what is done. As for teachers there must be a minimal effort to set this up and maintain this software.

Hope the above is clear as my English is not that good.

Kind regards
Eljo