One's first investment should be in a couple very good knives and a way to keep them sharp.
The feathers dull blades quickly and a knife that isn't super sharp will cause more injury to you than the bird.
You also want to decide how you'll store them. Vacuum seal and shrink bags are the way to go to prevent freezer burn and I prefer the latter.
The reason is, I've used a couple different vacuum seal systems and while they may be versatile for lots of different foods, they require a machine which can fail. If there is oily water from the chicken that gets sucked out, they don't always seal. You are also limited to the size of the bird that will fit into your machines product. With the shrink bags, you don't need a machine. They do all the work and they come in multiple sizes not restricted by the size of the vacuum.
SHRINK BAGS ARE THE BEST THING SINCE SLICED BREAD!!!!