Kris,

Before you do anything you need to talk to the city, township or county planning and zoning department to find out what their rules and requirements are for lot splitting. Typically you will need to fill out an application and submit a survey showing the property boundaries with the proposed lot split. It then will go before the P & Z board for recommendation for approval or denial and then be sent to the counsel or board for final approval.
Hope that helps a little!
Have a safe and joyous Holiday Season!

You need to contact the city in order split your property approval