here's how AST does it.
The colony members are picked (or a local is picked) and all paperwork done. The women then go through the pinning ceremony (where you get your new member pin) and begin the new member process just like any other chapter. They have alumnae, colony advisors, and traveling counselors teach them everything they need to know about AST, including the history and how to take care of all chapter operations. During this time, the colony can recruit additional members. After the colony has completed certain requirements (which are different for each sorority, but the colony is told what the requirements are), National Council and Staff come for induction weekend, in which all the women are Initiated, Charter is awarded, gifts given, banquet and general celebration ensues!!!!
Of course, this isn't the detailed version, but you get the idea!!
Good luck, and keep us posted on how things go!