How to buy and sell Tron TRX?

Could you please explain, in detail, the steps involved in purchasing and selling Tron TRX? I'm quite new to the cryptocurrency world and am looking for clear instructions on how to navigate this process. Would it be necessary to set up a wallet first? And which exchanges are reliable for Tron transactions? Also, could you offer any advice on timing the market for optimal buying and selling points? Thank you for your assistance in this matter.