Your city's/county's building codes will tell you how big your footing need to be. Rebar is always good in the footings for added support. Back fill with sand as needed and pack it. Cover the sand with a thick plastic as a moisture barrier, use foundation wire on top of the plastic. With a pad that big you need to use joint expanders. This is used to control the cracking of your slab. Cracking is good BUT these will control where the cracking occurs.
For pumbing or electrical coming though the slab, you'll need to dig your trenches, lay pipe, etc. before you do any prep work. This is not an all inclusive list but enough to get you going. There are two ways to pour a slab; footings THEN the slab or pour the footings and slab all at once. Both have advantages! Good luck and congrats on staying debt free!!! :thumbsup:
Bull float... [ame="http://www.youtube.com/watch?v=6RS6425XuXA"]http://www.youtube.com/watch?v=6RS6425XuXA[/ame]
You'll need to rent a trialing machine for a big slab.
Bull float will smooth out the slab after you pour it. After you bull float it and you can just barely walk on it... time to use the trialing machine. Visit youtube and you can see a bull float and trialing machine in action!