I'm wondering if I'm missing anything: Mortgage (20% down, so no PMI) HOA Electricity Gas (None, as the new construction house has an electric stove—everything is electric) Water Bill Camera Security System Internet Lawn Care Regular MaintenanceQuestions: Will I need to pay for trash? 

I am installing a security camera on the northwest corner of the garage to monitor the garage door and part of the common area where a criminal is most likely to approach the building.

Even if you rent to someone who doesn’t have full custody of their children, you need to delead if the children will be staying there regularly, such as on weekends.

Those are properties/parcels that didn't sell via the regular tax sale. 

Was this on a regular interior lot where the garage was behind the house or was the garage on the side of the house; was there an alley behind?

Unfortunately it’s not capital gains because you owned it less than a year, its regular income tax.

I am thinking of converting it to a regular apartment so rents can be raised easier and increase the sale price in 2-3 years. 

This happens regularly, according to the on-site care taker of the property.

You should do this at least once a month and always monitor the market's movement.If the current tenant is really good and you want to keep them, offer them a renewal with an increase 5-10% below market.

Rent and condo fees (if applicable ) are regular, insurance and property taxes are once a year, repairs are random and (hopefully) infrequent.