Just about everything I know about classical guitar I learned from Frederick Noad’s method books and compilations. Get them, and learn everything he has to show you.
I don’t have it in the slideshow yet, but I highly recommend Scot Tennant’s “Pumping Nylon” book. It’s a great technique book. It’s not just for classical musicians however. All the left hand exercises are applicable to any style of guitar playing. If you’re interested in basic fingerstyle guitar, there are many great exercises to get you up to speed.