Pick up some clay from the pound shop and play with that first with just your hands. Constructing shapes from a pliable medium is one thing, but pulling shapes deductively from a blank is unforgiving. The clay will give you a sense for visualizing and creating things in 3D before putting any money in to tools or wood. Additionally, look up how to dry and prep wood for carving now and get started on that so you have a surplus of material to work with when your tools arrive. If you never end up going forward with carving, then you have firewood.