Vacant for 7 yrs. Rezoning What to do first?

Hello. Currently under contract of a residential property that has been sitting for 7yrs. It was formally a day care and I will be rezoning it for a youth center. Does anyone have any suggestions on the steps that I should take to get this property in a habitable state? This is my first commercial property and I had to fire my realtor because they insulted the seller. So I am out here figuring this out all on my own.