return on cash flow property question
I'm been looking through the site and am having a little trouble finding what I'm looking for.
Basically I'm looking at a property for 67k renting for 760/month
The TK company claims $408 in cash flow but that doesn't account 10% for PM, maintenance, vacancy [although they have a 3.5y average], rainy day fund, and other operating expenses.
Can someone point me in the right direction or suggest what they use? I find that the calculators ask me for numbers and percentages that I do not know just yet as I am new to this.
Thanks in advance!
John