Question
I am buying a house with a backyard.  I want to put a driveway in the back around 20 by 20 ft sq and i want to do it with brick pavers.  However the the yard is backed up against an alley that is divided by a old fence that needs to be replaced.  I need to put a gate up in place of the fence that comes up flush with the edge of the alley.  The problem is that the alley isn't completely flat and I was hoping to put a fence with rollers so that i could slide it open.  I was thinking about building a 1ft by 20ft section of concrete so that the rollers or track could rest on.  Would it be easiest to build the cement slab for the track and put the fence up and then build the driveway after?  

The backyard is also lumpy and rocky with terrible soil.  I figure that I should level it out and add new soil so that I can put down sod after the driveway is done, so I was thinking about just leveling the whole yard first possibly...?  Anything that you might be able to recommend for prepping the ground so that I could put in some palm trees and bird of paradise plants would be appreciated, but my main concern is about how to prep for the driveway, and whether or not you think I should put the concrete slab and the rolling fence in first?

Thanks, Jim

Answer
I wouldn't recommend putting any rolling gate or slab on uneven elevation.  You don't say where the home is, but given your reference to plant materials; I will assume it's a warm climate.  Even so, without site prep and grading, you will almost inevitably have issue with gate opening and closing without a level base.

Level the entire area, and put the drive it.  Have the gate meet the drive to have the cleanest, most functional results.