I am doing a grandmother's garden right now. I read up a bit on it through some magazines and books I have here, but I don't know of any online tutorials. I am using recycled file folders as my templates. I have a ways to go to complete this project, but I am in no big hurry.
I'm actually working on it over my lunch breaks at work.
Hopefully others here will be able to put you in the right direction for some tutoritals! Good Luck!