All_repos_on_same_filesystem.mdwn

Hi,
 I am looking to find out the best way to use git annex, when all repos will live on the same filesystem, using a central repo.

What I have so far is, after creating the main repo (mainrepo).

Create clones via: git clone -shared mainrepo clonerepo

Then  use "git annex add" and "git add". When it comes to making the data accessible to the mainrepo, it is a little unclear to me. 
There is a lot of disjoint information regarding pull/pushing content and which directions use hardlinks vs copies etc. So I 
was hoping that someone could fill me in on best practices.

Thanks in advance!

Pete