Once the finish on everything is throughly dry, glue on the fret board and the bridge. With the bridge, use wooden dowels through the location holes...
... and take care to press them all the way down flush with the bottom of the saddle groove.
With the fret board, use plastic dowels that are too long, so that you can pull them out when the glue is dry.
With both, be ready with a pointed stick and some damp patches of cloth to clean up any excess glue that seeps out from the joints.
Next: Position dots
If you find any of this helpful I'd certainly appreciate a "tip" :-)