Cost of cleaning land, gravel lot

[Matt Pieper]

Looking at a property in Southern WI that has an existing building plus 5 additional acres for expansion.  
My thoughts are to keep the existing building in place and clear an extra acre to begin with for outdoor storage (boats/ RVs/ cars, etc).  

Does anyone have experience clearing land and laying down gravel?  Looking for a rough ballpark estimate, the land is lightly wooded.  

Thank you