I've scoured the internet and learned a great deal (all of the general stuff, purchasing, redemption, processes, etc.) but I would love some information from an investor who's purchased tax liens and and especially in Baltimore city, MD.

I've also been a tenant a couple times.I have spent the past few months searching different real estate related topics on the internet, which led me to BP, and trying to learn a little about the market I'm interested in(Philadelphia).

This is probably time to mention that I am telling you to be aware that there are many blood-suckers on the Internet and just be aware of their intent and they know how to sell based on emotion to sell things you do not really need and real estate brings in a bunch of money from beginners that have not learned yet to be aware of them.I do think that technology has much to do with effective marketing and sales.  

I'll make sure my marketing material includes that when it's an assignment of contract.

They all use the he same training materials and take on the KW culture but there could be a difference between.

BP has a lot of good material and knowledge to move forward on!

If the roof didn't already exist or you are improving the roof (upgraded materials/design, adding dog houses and dormers) then it could be capitalized.However, if it is just a repair/replacement, you could consider it a capital item because it's a project over a certain dollar threshold, with that threshold being set by the company you run and used on a consistent basis.

Thank you for the recommendation, I will be sure to look up some of David Ramsey's material.

He has lot's of material and focuses on it. 

-I have concerns about my tools, construction materials etc being there unattended, but at the same time, I will have my entire home there unattended when I move in (albeit more secured).