Start collecting any and all vintage items that call out to you. My first purchase was an older box style radio. Then I bought a turquoise colored coffee pot and it went from there.
Finding vintage things...
Ebay, Thrift Stores, Antique Shops
Make from scratch.
Sew, paint, or create using what you already have.
Store bought vs Hand .
Sometimes you have to buy from a store, rather than make it, but try to do both.
So much fun in receiving cute vintage bird house campers. The first one (top pic) was given to me by my son's girlfriend a couple of Christmas's ago, then she gave me the (bottom right) one last year at Christmas. I found the red Christmas light up one at Hobby Lobby and just had to have it to add to my collection.