For this guitar the bridge can be made from a variety of materials. I prefer a short piece of hard maple. The piece I use, and the one supplied in our kit, is around 40mm long, by 10mm x 8mm. You can lower the bridge height and therefore the string action by sanding the top of the bridge. Always sand off the sharp edges so the strings have a smooth edge where they contact the bridge.
Position the bridge just a millimeter or two behind the 25″ scale mark (or what ever scale length you are using. You can mark this point with a pencil and simply slot the bridge in position. Alternatively you can glue the bridge in place.