foam core board
cork roll or cork tiles
modge podge or any type of glue that's not too watery
knife / scissors
Next, after you've finished protecting your work surface, spread modge podge or other adhesive over entire cork surface. Now carefully lay your map on the glued cork. You may have to work fairly quick, as the modge podge sets up in a jiffy!
*Note: To save a little fidgeting with this step, I laid my map over the surface before the glue, got it centered (mostly) and pre-folded the edges so that when I placed the map on the glued surface, it would just fall into place!
After you have placed the map on the cork, work quickly to smooth out the map, trying to ensure that there are little to no air bubbles underneath. After you're satisfied with your work, you may need to place some heavy books on top just to hold it until the glue gets tacky. (old school books work well for this)