Single Family Home On Multi Family Zone

[Joe Clifford]

Hi - I just purchased a single family home sitting in a multi family zoned lot. What would be the Steps to make this home a legal 2 family. I'm looking to build a 1 bedroom apt and  live in the front part of the home. Great potential, but just stuck on where to start looking for legal approval before fully jumping in. Considering i'll be living there is there do I need to apply for a permit or get permission from the town to rent a "Room"?  The Majority of the homes on my street are all multifamily (Duplex/ Triplex).