Creating a large blog with many categories and authors need advice on setup

I am creating a blog with many authors (over 100) and many categories (over 400) I need advice as to what is the best way to structure the categories and assign users the correct permissions.

Group 1

Most users have very limited permissions, able to log in to front end, no ability to edit joomla articles only able to add/update EB5 articles for their 4 categories.

Group 2

Users still have limited permissions, able to log in to front end, no ability to edit joomla articles but are able to add/update EB5 articles for their 4 categories and other select users categories also. ie User A can update their Categories (What's Happening, Resources, Assignments) as well as update a category that User B, User C and User D can update (announcements) But Users B C and D cannot update user A's Categories (What's Happening, Resources, Assignments)

Group 3

Users still have limited permissions, able to log in to front end, no ability to edit joomla articles but are able to add/update EB5 articles from any Category.

Group 4

Users are, able to log in to front end, and can edit joomla articles and are able to add/update EB5 articles from any Category.... but do not have backend access.

Sorry for the long description I need to set this up right and i am not sure how the joomla user ACl and the EB5 ACL work in conjunction with user groups and team Blogging. If it is easaier I included my site details if you could setup a few as an example I could follow that pattern for the different groups and users.

Thanks,

Ryan