I'm still new to CVS, so please take my advice with a grain (or two!) of salt.
I think what you want to do is create a group and assign people to that group. Then anyone in that group could access those files. The group man page should help you get started.
The CVS directory is owned by root and is part of the group I created. My husband and I are both members of that group. Now, when I check in a piece of my writing, my husband can check it out and proofread it, then check in changes for me to see.
As for "other permissions", I'm not sure I can help you there. I'm sure there is a way to have all files in a directory set with specific permisions, but I don't know how to do that.
I hope this helps...