In what order does the thermostat and gasket go?

The thermostat goes in the recess of the manifold . The gasket should be glued to the thermostat housing. Silicone sealer makes a metal surface slippery, so if used, should be done sparingly. Let the two adhere and install the housing to the intake. Do not over tighten as a bolt could possibily break. BE SURE THE SURFACE IS CLEAN of the old gasket.