Practice in light air first. Bring someone along who knows how to fly a kite, will be worth more than his/her weight in beer.
launch and lower the spinnaker from the leeward side, on a broad reach, in the blanket of the mainsail.
Once you get the hang of it, you just might like it for cruising. On a light air run, it's hot, boring and slow with just the main and a limp jib in its shadow. A spinnaker, slightly overtrimmed, can make that leg of your trip fast enough to keep you away from using the engine, and make it more interesting. Just be sure to get it down before any bad weather reaches you.