Being that you're in the other unit, you'd be paying over $2,000/month yourself - NOT including taxes, utilities and capex. 

Account Closed yeah I've been selling a lot of fourplexes lately and they should all cash flow, even with appropriate numbers for vacancy, utilities, repairs, capital expenditures, and property management.

Keep in mind your holding costs also will include utilities and insurance (I assume you plan to carry insurance). 

Residents pay all utilities.

(After accounting for other expenses: utilities, appliance, extremes I am looking at a total of about $1,020/ Mo.).

not reallyAnother level of complexion is losses that are passive may not be utilized to offset your other income while some taxpayers can. sometimes it's best to keep things simple. 

Generally, if there isn't a separate meter, landlord can't make tenant pay utilities as there is no way to truly decider what portion of the bill belongs to which tenant.

Besides the obvious costs like utilities, insurance, maintenance, and taxes, are there other ones I need to know about and what they would run?

The low money down and the ability to utilize a 203 B or K, that program is pretty nice. 

That is before other necessary costs such as utilities & water and other basics that are not necessary but often included anyway like phone, internet and cable.