I'm looking to purchase some land in Martinsville, VA from out-of-state, and wanted to know if anyone is able to recommend a reliable property manager that services Martinsville, VA.

Out of curiosity, what custodian did they recommend to you?  

This is (1) not something I'd recommend to a beginner, and (2) not something I've been able to do yet. 

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant who specializes in real estate taxation, business taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.

As you develop the park I would strongly recommend your homes be individually metered for water, sewer expense prorated and garbage paid by tenants via individual can service. 

BiggerPockets also has a calculator to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.

I highly recommend the book real estate by the numbers.

If you're open to looking at some resources here's what I would recommend you start with based on what you've said:1.

If you are familiar with this area, any further recommendations or resources you are willing to provide, I am super grateful. 

Recommend you take a look!