I like the portion about the property manager and how they take care of everything.

Depending on your returns and how recent any major work has been done, it is possible to adapt to the needs of the specific property (i.e. if the plumbing, HVAC, roof, etc. was all done in the last year or two you can focus more heavily on cashflowing into the next property and setting aside a smaller portion as an insurance policy for the next big problems).

@Carlos Leyva it really has less to do with the size of your pay check, and more to do with whether or not the asset is really going to cash flow based on underwriting for real world expenses.

I know you said you are looking to do seller financing, however, with conventional financing your lender may escrow for taxes and/or insurance in which case you would pay your lender a portion of the taxes and/or insurance on a monthly basis.

I can't remember what size the panels are in my duplexes but I doubt they can handle that additional load. 

Anyway Ive had my head kicked in 14 different ways and am starting to master a good portion of the flipping buisness, Im now a jack of all trades.

Plan is to subdivide lot, sell a portion of the raw land, and rehab the existing house for a rental that we will hold long term before sale. 

You can reinvest a portion of the proceeds and pay CG tax on the boot.

@Gregory A.A 10% early withdrawal penalty will apply to the portion of withdrawalsfrom your Roth TSP that are attributable to earnings if you separate from your federal job before the year in which you turn 55.Contributions should be penalty and tax free.

Definitely include property management fee (Around 10% for that size) in your operating expenses.