Hate to sound harsh but if you wanna learn spend your money! Seriously man, a martial art is not something you learn from a book or TV. There's a lot more going on in a kick that throwing your leg out there and even if you come close to the book/movie your angles, form, movement, chambering, snap might be wrong and you end up doing serious damage to yourself. Your breathing (yes breathing) might be wrong and you'll never get full power.
If it's worth it to you, you'll work, get the money and PAY for it. After all, if it's worth learning it should be worth the financial as well as the time commitment. You say you and your friends are interested in learning. Find an instructor and pool your money for a private class. Or a high ranking student might be willing to take some money and teach you some basics.