How to buy crypto tokens?

As a novice investor seeking to venture into the world of cryptocurrency, I'm curious about the process of buying crypto tokens. Could you please break down the steps in a concise yet informative manner? I'm specifically interested in knowing how to set up a digital wallet, choose a reliable exchange, fund my account, and ultimately make the purchase of crypto tokens. Additionally, I'd like to understand the importance of considering factors like security, transaction fees, and the availability of the desired token on the exchange. Your guidance would be invaluable in helping me navigate this new terrain of investing.