Hi starting a real estate investing company and looking for the best accounting software to manage financials from expenses; collecting rents; buying and selling, etc.

How will they handle maintenance, rent collection, tenants breaking the lease, non-paying renters, etc?

Assuming NJ allows it, I would add a clause in your lease specifically calling out the forfeiture of deposit if the tenant breaks their lease early and/or does not move in.You may also be able to attempt to collect rent until the unit is re-rented.

After the statute of limitation expires, the lienholders cannot collect, with a few exceptions.All lienholders must send a demand letter to debtors with the intent to foreclose on the property, the demand letter must be sent by certified mail.

If not leave as is and collect rent and @Jay Hinrichs mentioned as long as not full of rodent or bugs then I would leave as is.

Personally I'd want to know any expenses over a specific dollar amount and would want to know about lease violations, rent that wasn't collected by the 15th, tenant requesting early termination etc. 

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Are NNNs truly covering things like RTUs, parking lot resurfacing, all landscape and litter collection, all common area utilities, etc.  

Should I tell him to let her inside and collect her stuff or should I let her contact the police and go through small claims courts and stay out of it and leave the old lease intact till then.

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little or negative relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560, little to no good tradelines, lots of collections & chargeoffs, recent evictions.