GPS Query

Recently received a Garmin Edge 705 as a gift and a little confused by the technology... so the question to all you high tech mtbers is... is it possible to plan a route on OSI trailmaster and/or Google Earth and then upload the route to the garmin in order to follow the route by GPS while on a spin.
Any info on how to do this would be greatly appreciated. Thnx, Colm
Feck, i can't even work my normal sat nav, 9 years ago i set of down the shops and ended up here, haven't been able to find my way home since.