If you use driftwood, be sure if it's origin. If it was in saltwater, it will need to be soaked in order to remove salt build up which would kill orchids.
Mount orchids according to light requirements. Do not mount to trees because your area can be exposed regularly to cold winter temperatures. Many won't do well if it goes below 40 on a regular basis. You are better off keeping all mounted plants mobile so you can bring them in if temperatures demand it!
Always mount the orchid with the new lead facing the mount. Never away. When the new roots appear, the plant will take to the mount and establish itself quicker.
Be prepared to water your plants MORE often in warmer weather.
Suitable hosts wood include cypress, live oak, tree fern and cork bark!