The simplest type of base or pad for your container would be a level spot, ideally excavated approximately 4 inches down to a flat, level surface, spread crushed concrete and compact it to about two inches, then spread some on 21A crushed limestone on top and compact it to about two inches as well. Both of these products have a binder in them that will help the pad stay together yet still allow the moisture to drain through. This method will allow the container to move around with the frost but it will work well for storage containers and other uses where you will not have utility connections or the container is attached to other structures.

If you are going to live in the prefabricated house, have utilities connected to it or connect it to another building then you should consider installing a pier foundation. This is still a fairly straight forward project and if all the proper tools are available, you should be done in a couple hours. Don't pinch pennies here if you don't have a post hole auger, rent one. A 12 inch bit will work but I would recommend a 16 inch or 18 inch bit if available. The less stable your soil is the larger diameter your piers should be, if you have sandy soil, wet soil, or it has been filled in the past then you should go to 18" piers.