I have a 10x8 shed that I use exclusively to store real estate materials and supplies.

A deposit at the start of a build is normal, this usually pays for materials and labor to get started.

Oh and it's even more fun when you get a surprise package in the mail with fun stuff and apparel! 

I know I can create a series of my own documents regarding this in Word and Excel, but am wondering if there is some kind of software package out there that handles this problem?

I don't know how to post documents to my profile yet or if that's a thing but I just made a 4 page ASR package based off of another site.

I am asking anyone knowledgeable to provide any measures or strategies that could materially make a difference in heading off the risk of serious financial harm of the eviction process with non-paying tenants.

You should treat it as a luxury package rather than regular STR. 

For example, I can't see a way to use any marketing packages??? 

From the public website,The BetterLife Tribe program offers everything you need to achieve real estate success:Monthly Calls with Brandon Turner and top real estate experts, providing you with insider knowledge and strategies.1-on-1 Personalized Coaching to tailor a growth plan specific to your goals and challenges.Access to the reiOS System of Success, the exact operating system Brandon used to scale Open Door Capital to over $1B in assets.World-Class Real Estate Education and Tools that equip you with the skills to dominate any market.A Thriving Network of 1,000+ Active Investors ready to support, inspire, and challenge you on your journey.Seems like a great program like many do in the marketing materials

I use a CPA, too, but I like to do my own bookkeeping throughout the year and send him a tax package quarterly to review.