If the Flash has a Nikon connection, then you would probably need
Nikon fit remote cord. There are cheaper copies for less than half the price of the Nikon cord available on Ebay. Some cheaper with a much longer cord too.
If using that cord then the attachment of the flash to the tripod doesn't need to be anything special as the connections are on the cord, which which connects to the
stand/connection to the tripod.
Someone with more experience of flash may pop by with an easier/cheaper way to do it.