For units such as these, you need to get a rough sense of rents, property taxes, and management fees before even thinking of moving forward. 

Landlords will need to raise rents at least $15-$20 per month per property to cover the $20 annual fee and $150 inspection fee.

But there's lots of opportunities to tie in with local management for a much smaller fee. 

Assumptions: Lowest Appraisal Loan INCOME AND RATE OF RETURN Purchase Price 154,900.00 Loan Amount 123,920.00 Down Payment 30,980.00 Estimated Annnual Gross Rents 15,540.00 Estimated Annual Equity Paydown 1,700.18 Estimated Annual Principal & Interest ($8,350.19) Estimated Annual Property Taxes ($3,000.00) Estimated Annual Homeowners Insurance ($746.78) Estimated Annual HOA Dues $0.00 Estimated Annual Management Fees ($1,877.75) Utility costs to be paid by landlord (if any) Annual $0.00 Lawn mainteannce costs to be paid by landlord (if any) Annual $0.00 Indirect Vacancy Allowance Annual ($) ($155.40) Repair Allowance Annual ($) ($621.60) Misc. bucket for costs per month Annual ($60.00) Estimated Annual Net Expenses ($14,811.72) SUMMARY OF RETURNS Estimated Annual Gross Income $2,428.46 Estimated Monthly Gross Income $202.37 Estimated Annual Gross ROI 7.84% ESTIMATE OF CASH FLOW Loan Amount 123,920.00 Interest Rate 5.40% Loan Term in Months 360 Estimated Principal & Interest ($695.85) Estimated Monthly Taxes ($250.00) Estimated Monthly Homeowners Insurance ($62.23) Estimated Monthly HOA Dues $0.00 Estimated Monthly - MISC ($69.75) Estimated Monthly Management Fees ($156.48) SUMMARY OF CASH FLOW Estimated Monthly Gross Cash Flow $60.69

Just to pick your brain a little more if possible, how would I find the fixed cost for my area (insurance, closing cost,commission,inspection fees etc..) would you recommend the same apps or something else?

Get an accountant and for estimated fees. 

You don’t have to go through a whole approval process with them at the time, just ask what their standard requirements are (for LTV, % rate, fees, turnaround time, etc).

Most banks are willing to coordinate this with you for a small fee. 

You are entitled to a minimum of a 5% fee, over the entire life of the certificate though, whenever/if it is redeemed.

In addition, we live in Jersey where there is a fee for everything and the only thing we get in return for our fee is a receipt.