Just wanted to mention a few things:
Start your build thread in the appropriate sub-forum, depending on which costume you are building.
I would register for access to the MWG forums http://www.midwestgarrison.com/ You may find armour parties or folks in your area who can help you.
Gather your build materials and any other items you may be missing as mentioned by others
Start bookmarking threads and reading!
Though you can build your armour to Centurion right away, note that the process goes: basic approval with your garrison, then application for EIB here on the FISD, then application for Centurion here on the FISD. Your GML will not be involved with L2 and L3 approval.