I agree with John above.
There's a wonderful forum about fermentation, including lots of pickles, and I'm sure it's got fermented radish pickles.
http://www.wildfermentation.com/
The book
Wild Fermentation by Sandor Katz, or his more encylopedic
The Art of Fermentation, are both great resources if you want to start fermenting anything.
Wild Fermentation is a great inspiration, and may remove your fear of the unknown.