I suggest listening to the BP podcasts and reading through the blogs and books they offer.

I've been informed that completing the course alone may not be sufficient to pass the exam, so I’m seeking advice on how to prepare effectively once I complete it.Currently, my only other resources include a YouTube video, five practice exams, and a textbook.If you have any additional suggestions—whether online or in-person, paid or free—that could help me effectively prepare for the exam, I would greatly appreciate them.

I suggest focusing on building your "Core 4" team—agent, lender (one who can finance both the purchase/rehab and refinance is ideal), contractor, and property manager.

My inclination is to suggest paying back the PML 70% of the land proceeds (presumably $168K) at that closing and then hold the remaining loan until I sell the house. 

Ebooks, podcasts like @Bonnie Low suggested and start running numbers on every deal you see until you know how it all works.

Your suggestion would be considered a negative cash flow investment.

I've seen many people suggest a cash out refi but I like the flexibility of the heloc.

Any suggestions or insights are appreciated!

If credit scores are fine, and you are just new to the work sector, then I would suggest doing a conventional loan with a strong income "non-occupying coborrower". 

Any suggestions and help would be gladly appreciated thanks.