I would second the advice to start with buying a share in a well established club flying a common simple type like a C 172 or Pa 28. Shares in common types have predictable costs and are easier to sell if you decide to move on.
Not to be a kill joy but the drop out rate a few years post PPL is quite high for a variety of reasons. Unless money is no object dipping your toe by buying into a group with a simple aircraft is a great way to get started without going all in.