Ok. You need a regulator with flowmeter greater than 15 lpm liters per minute (nitrogen). They usually come with a "barb" where you connect a hose. The barb is 1/4" size and one can get a hose to fit that easily at big box housegoods stores.
These regulators will have the CGA-580 connection that will work for a nitrogen tank. (This connection works for argon, CO2, nitrogen etc.) See if you can find one, maybe on the "jungle" site, or from a welding" site, and post back what you find.
Are you planning on using a bag or a hood?