@Shayla Collins
I'm working on a new construction at the moment in NJ and there are a good amount of new challenges I have run into:
1. Zoning - Ensuring what you are trying to build is compliant with the zoning for the lot. With my other property which was to renovate and rent out I did not really have to worry about this. Typically your realtor should know the zoning for the town or can connect you with an architect who is familiar with what can be done without a variance which is a toss up.
2. Demolition - If you bought a plot of land you do not really need to worry but if there is an existing structure... disconnecting water, electric, and gas from the service providers takes a while and requires permits from town. You would also have to consider demolition costs into your numbers.
3. Loans - You can check with a local loan provider but a construction loan would be different and I believe higher interest than a renovation loan. If you buy the property with a mortgage then getting a construction loan on top would require additional assessment.
4. Build - Similar to large renovations you want to choose a reputable builder which may be difficult. Depending on the area you are in you are in there may be challenges to building when the ground is frozen w.r.t. the foundation.
Good luck!