Preservation does not have to be difficult. Physical preservation is probably the best place to start with a collection. You want to make sure your materials are properly stored and cared for to ensure their longevity. There are easy steps that can be taken to do this.
More detailed information about the digital preservation process is available at the PDF below and on the "Resources" tab of this section.
An additional resource would be the State Archives division of the State Historical Society of North Dakota. If you have any questions about preserving your physical collection, they would be happy to assist.