If you can go search some teacher.
Very good heve some videos, important also!
Search and by good one!
Its practice and will make diference than only look on a DVD or Video.
training your sense of speed and distance, we have to really avoid obstacles and thinking really long distance from hard obstacles...gusty, lifted...onsore winds...but schools doing good in that!
Also how to proceed when you have problems, lot lines and selfrescue,
...I use always Wipika and Naish...I have less experience in Foils.