Its not recommended that you purchase your new bow until a few weeks after you have completed the beginners course. The club has a range of bows that you can use until you decide exactly what you want.
Once you have decided that you want to purchase your own bow and accessories, there are lots of archery shops to choose from. We don't recommend that you order on-line or from eBay, because you need to try the bow in person so it can be set-up specifically for you.
Locally there is Quicks Archery near Hampton Court, or Perris Archery in Uckfield, Sussex. They will be able to help you choose the right equipment.