first steps in building on raw land

[Holly Wenzel]

Hello, I've recently purchased raw land, and I am wondering what my first steps should be moving forward. Do I need to get it surveyed, or first speak with an architect? If anyone can give some advice on first couple of steps to get the ball rolling it would be greatly appreciated. The lot is in Central Phoenix, on a developed street, so utilities, are nearby the land is uneven, I would say the elevation changes around 7 feet, and currently there is a wash going through the property. 

Thanks!