I’d like to invest in farm land but it’s extremely expensive and hard to come by as of right now.

Build a good spreadsheet and do your best to use conservative numbers (over estimate your expenses and costs and under estimate your resale). 

I am not doing repairs and rehabs myself anymore, but I do oversee the managers, categorize expenses, and pay bills outside of the property manager duties (insurance, property tax, large rehab, etc.)

The fees I charged as a LTR landlord more than made up for additional cleaning expenses.

There are expenses other than just the mortgage costs (like taxes, insurance, utilities, lawn care, maintenance, etc) that would have to be taken into account. 

Tax season often leads to creative interpretations of what can be considered a deductible business expense.

That's often because you don't really get to see nationwide stats very often and there are few individual investors who invest across multiple states it seems.Here are a few consideration to help you decide where to invest:Population GrowthJob GrowthLandlord friendly statesAffordability gap, average income vs median sales price.Some people also say look at where town will grow and invest in the path of progress.Good luck and I wish you unlimited cash flow and appreciation.

Can someone please tell me if there is a list of common house hacking start up costs and expenses I should expect?   

If so, does the rental income give you any extra cash flow, or at least cover the large majority of the mortgage/expenses?

You can potentially own the property with no out of pocket costs (rent covers expenses and then some) PLUS you get the added benefits of equity, appreciation, and continuous income from the rent/cash flow.