Yes, first get yourself a copy of Beginner to Winner
http://www.surfsailaustralia.com.au/showProduct/DVD+and+Video/Windsurfing+-+Instructional/427075/Beginner+to+Winner+DVD to get honed on correct stance, tacking, gybing and waterstart basics.
Then when you want to really tune up your waterstarting technique get The ABCs of Waterstarting
www.surfsailaustralia.com.au/showProduct/DVD+and+Video/Windsurfing+-+Instructional/420092/The+ABC%60S+of+Waterstarting I have seen both of these DVDs and highly recommend them.
Also go to www.zinio.com
www.zinio.com and register.
Windsurf
www.zinio.com/singles?issn=0958-5508&ns=zuk and Boards
www.zinio.com/singles?issn=0590-7337&ns=zuk are both UK magazines and have a lot of articles on technique for beginners and intermediates. Follow those links and you can browse the archives, including seeing the actual contents pages, and buy the individual mags with the articles you're interested in.
Guy Cribb
www.guycribb.com Jem Hall
www.jemhall.com/ and Simon Bornhoft
www.windwise.net/ have useful tips and articles on their websites. They are qualified instructors.
If you want to discuss what you see on the DVDs, or any stuff you've read on the web or magazines, post here or send me a PM and we'll go from there.
Once you've got the knowledge and a picture in your head of how the techniques should look, get somebody to come down for an hour or so one day with a video camera. You will then be able to see what needs improvement.