Try these web pages:

http://.electricscotland.com/tartans/quick.htm

http://www.electricscotland.com/webclans/septs.htm

http://.electricscotland.com/webclans/alphabetical.htm

http://ww.electricscotland.com/webclans/spellings.htm

These should get you started. Do not take any of it as Gospel untill you can confirm what you finf there. I would visit the Scottish Tartans Museum Website and ask them further questions in an email. Their links are all through out xmarks...