Installing Social, Blogs MU or any other MU + Buddypress theme


I wish to create a content reach social network for my future language-education website.

I wish to know the right order of installation, if I wish to have a main site with buddypress on it and to have subdomains connect to it with MU (to have the same login for all).

For example, have the social theme installed on the mainsite (allowing language teachers and students to connect, and students to connect with eachother) and the directory of language contarcters (teachers, translators, writers, etc.) installed on a sybdomain.

In the same way, I wish to have other subdomains connected to the main site.

Please advise, what is the right way to install this new operation?