I would just make sure you're in either Rising or Legacy, then do /wild until you find a nice spot that you like.
Rising will have more free land and 1.7 biomes.
Legacy has older towns.

Remember you can do /getpos to find what world you're in.

 

The main worlds are not reset, only the mining world and the nether.

 

@drodude

• Go to the legacy or rising worlds. do "/getpos" to make sure what world you are in.
• Do "/wild land" and browse for a generally nice area.
• --> This <-- is the mayor application guidelines. You need to zone a town, make sure that the boundaries are at least 15 blocks away from all other towns.
• You need to place 4 corner posts of the town. Get/make 4 signs.
• I suggest preparing a thread for the mayor application, and fill it out as you place town posts.
• When you have a good starting place, place down a sign, write "Post A, Town name" , do "/getpos" -- it will list you your current coordinates, write those coordinates in you application.
• Minecraft coordinates are a little funny, heres a diagram
• 
  
• Press F3 to enable some info to appear in the top left of your screen. You will notice that it shows whether you are facing North, South, East, West.
• From Post A, face another direction, and add or subtract 199 blocks from the "/getpos" coordinates of post A. Then looking at the integers between the parentheses in F3, walk to that direction.

• For example, if post A is at X 100, Z -150. If you want to go east, add 199 to X to, the next post is at X 299 Z-150, walk to those coordinates while watching the F3 integers between the parentheses ( ). Do "/getpos" to make sure you are right, then plop down Post B.
• Now you go South, so that is the Z axis. You need to Add 199, so you need to go to X 299, Z49. Plop down Post C.
• Now go west. West is on X axis, subtract 199 from X, so you need to walk to X100, Z49. Plop down Post D.
• Now, if you did this right, you should be able to walk back north, and in 199 blocks, you should hit your Post A, and you've successfully made a square.