What’s the next step in lot buying process

[Ekta Patel]

So long story short, I went to Tax sale and got 2 lot for 34k total in good residential area, one is 6 acres and other one is small, single family house lot. What would be the next step to get money out. Who I need to contact to find out about how much it cost to build house, is it possible to build house on them, is subdivision possible for 6 acres? Architect or county zoning or someone else? What book should I read to get some idea?