Try to get paid to remove old buildings.
Lots of bracing required. On anything that rests on a
concrete floor with no wooden floor above, it's important to tie the walls together well. If buildings need to be cut into two or more pieces, build all support walls and install bracing before cutting.
I've moved a couple small buildings myself and have prepared about 50 for moving by a house moving company. Once you have a particular one in mind, post photos here and send me a PM. Photos of interior and exterior and of framing will help.
Get each building checked for asbestos and other toxic substances before committing.
Edit - I see you are new here Jon. Welcome. You'll find many others willing to share their knowledge here. You can search key words, whenever you have a question. Also check the related topics at the bottom of the page.