In reference to your original question you can start at the New Haven Housing Authority office and list your apartment on the housing list of available rental properties in the city.
New Haven Housing Authority
360 Orange St New Haven, CT 06511
Congratulations on your purchase.
To find a qualified tenant you should list the rental with a licensed Real Estate professional. However you should know we as agents cannot discriminate in any way, shape or form. If you are looking for a particular tenant then you can try renting the property on you own.