Welcome to kite surfing. You are going to LOVE it.
I just recently watched Into The Air DVD and Blowing Wind. Both excellent DVDs and highlight the dangers but more importantly the beauty and power of kite surfing. I highly recommend them and a good way to show off the possibilities to your partner or friends, so that you don't get that funny 'youre going to a strip club' look!

In terms of equipment, less is more. Go for four line kites, which are the norm. Yeah 5th lines are 'safer' but they do have other risks as mentioned above. I love the Mystic harness. It's light and snuggly. Just make sure what ever you get, you are not pushed to a particular brand and that it fits you 100%. enjoy!