Medusa, this is a pretty thorough guide. Even if you're not interested in growing your hair waist length or you don't have curly hair, I find that reading up on long/curly hair care is pretty informative. Those girls know their stuff!
http://www.longhaircommunity.c.....hp?t=34009
It's important to go silicone-free too if you go sulfate free. While silicones aren't inherently bad, they build up without sulfates to wash them out, so it's an all or nothing deal. I stopped using my former shampoo and conditioner when I realized that despite being sulfate free, the conditioner still had silicones that were crusting up on my hair :\
You will find a lot of these products at Whole Body (Whole Foods' personal care store).
I am technically not 100% sulfate free. I use Tresemme Naturals, which makes a low sulfate shampoo and a silicone free conditioner. I'm not naive enough to think that they are actually natural products, but that isn't important to me. It might be to you, though.
Since I don't wash my hair with shampoo every day anyway (instead opting to wash with conditioner), using a low sulfate shampoo every now and then doesn't cause too much disturbance. In the end, it's less expensive than most 100% sulfate-free products with no real difference in performance as long as I only use the shampoo sparingly. Typically I only use it once a week to wash out the coconut oil/olive oil blend I leave in my hair.
When you wash with conditioner, you have to be more thorough. Conditioners do have cleansing agents, but they aren't as harsh (which is the point). So get used to spending a few extra minutes really massaging and working it in to loosen all the dirt and grease. It might still require an adjustment period though.
For my body wash, I use Burt's Bees rosemary mint body wash. Before this, my skin was VERY scaly, itchy, and dry, and since making this change I cannot tell you how much better it is. I still need to apply a body cream after I shower, but it's not the end of the world if I forget (whereas before I'd be clawing at my skin all day). I still feel squeaky clean and it has a nice refreshing scent.
Also be aware that sulfate free products don't lather, which is fine, because lathering really has no benefit. They are also thinner, since sulfates act as a thickener.
Hope that helps.