Thanks for the kudos on the PrepCast. I'm glad that you like it!
The simple answer to your question is: As soon as possible.
The sooner you sign up & pay the fee the more motive you have to continue your studies and go take the test.
You mentioned that you have used the PrepCast & PMBOK so far for your studies. My recommendation would be to also answer as many practice questions as you possibly can. In this way you can gauge your readyness. Try these free ones here:
I assume your question is "Would owning my own business, which includes transportation and travel services to major tour operators/airlines count TOWARDS THE 4,500 / 7,500 EXPERIENCE HOURS."
Only you or PMI can answer that question.
Moderators: Yolanda Mabutas, Ahmed Amin, Scott Gillard, Mary Kathrine Padua, ERIC BARTLETT, Gail Freedman, Kevin Nason, Steven Mudrinich, PMP, Mark Wuenscher, PMP, John Wolverton, Tracy Shagnea, PMP, Jada Garrett
This interview with Simona Fallavollita (LinkedIn Profile) was recorded at the magnificient Project Management Institute (PMI)® Global Conference 2017 in Chicago, Illinois. We discuss the how, what, why and when of the changes that are coming to the PMP exam.