Set your printer settings to high quality and print out one copy of the pdf file (acrobat reader) which contains the patterns for all three 1: 144 scale shops.
To use wood or bristol board backing print the file on high quality paper which you can glue to the bristol board or wood.
To build the houses from card stock or photo weight paper, print them directly onto a sheet of cardstock or matte photo paper. You will be gluing two layers of this paper together for most parts so photo paper or card stock make a fairly sturdy small house.
If you want to attach the pieces to thin aircraft plywood or bristol board, glue the sections to wood or bristol board before you begin the assembly in the next step.
To use these little paper shops for ornaments, Christmas villages or Christmas railroad scenes card stock is fine. If you want to create full interiors and furnishings in a permanent display, you may want to glue the design to sturdier board before you begin assembly. The best glues for paper prinables are acid free or pH neutral glues like the Linco pH neutral PVA glue reveiwed here.