Paperwork
Kent,
If you haven't already, get in touch with your DAR. He/She will be the biggest help in this arena. My DAR wanted multiple copies of all the forms and his own version of a W&B.
From an actual time point of view.. a day is plenty to get all of the paperwork filled out. Having your registration is good. If you haven't already, request a Bill of Sale from Van's.. that will take a coule of weeks. Having the BOS and the Registration is good as the rest of the forms you just have to fill out.
Carefully read the instructions for each form.... FAA is picky about how you fill things out. If you call your FSDO and ask for a "Amateur Built Application Package" they should send you the following, all of which is good info!
FAA Form 8130-6, Application for Airworthiness
FAA Form 8610-2, Application for Airman Certificate
FAA Form 8050-1, Aircraft Registration Application
FAA Form 8130-12, Eligibility Statement
FAA Form 8050-2, Aircraft Bill of Sale (We don't need, Van's will provide.)
AC 20-139, Commercial Assistance
AC 20-27F, Certification of Amateur Built A/C
AC 65-23A, Certification of Repairman
AC 21-12B, Application for Airworthiness Certficate
AC 39-7C, Airworthiness Directives
AC 43-9C, Maintenance Records
AC 90-89A, Flight Testing Amateur Built A/C
AC 8050-88, Indentification Number Assignment
Special Airworthiness Certificate request