How/What do cash flows look like with maintenance and vacancy?

[Tanner Christensen]

I am very new to real estate but I have a goal to have my first deal done by August 31, 2017. I am looking a lots of different properties in different areas and trying to crunch the numbers. How is it that even though what I come up with is positive, it is usually very minuscule amounts. I am just wondering if this is correct?

With all expenses and financing it seems cash flow would be around $6,800 annually. However when I take some peoples recommend percentages out for vacancy and maintenance this drops to about $1,110 annual cash flow. Just wondering if this sounds right? Also wondering what most of you set aside for vacancy, maintenance, and eviction? 

Any input would be much appreciated.. Thank you! 

Tanner