The most important thing you need when planning a hiking or backpacking trip is a good pair of hiking boots. Check out Wilderness Backpacking Guide to see how to go about choose the best hiking boot for you.
This boot has great ankle support and is both waterproof and breathable, making it an ideal hiking boot.
You might be nervous about buying hiking boots online, but at many websites you get free shipping, even on returns. I find it helpful to buy a few pairs of hiking boots at the same time then choose which one I like best and send back the rest.