do you have an attorney or realtor? usually they will guide you.
if you have a contract signed and are in attorney review, you should have all the contingencies outlined.
you should do an oil tank sweep. that costs under $300. if there is an underground oil tank that was not properly decommissioned with permits, RUN AWAY!!
If there are no underground oil tanks, you want to schedule an inspector. not a contractor but a house inspector. once you get more experience, you can bypass the inspector and go with trusted contractors but for the first few houses, i strongly recommend not skipping the inspector.
you will have to schedule a CC and fire inspection if you decide to proceed. in Newark even if you fail the CC inspection, you can close with a conditional CC. That means you are responsible for all the items that failed.
if it is a 3 family or above, you should check the status of the Green Card (Certificate of inspection) with the state.
with Newark you have to be very careful with the area. The numbers will look attractive but a lot of times in that city it is attractive for a reason. PM me if you want to further discuss.