How to buy Omni USDT?

Could you please elaborate on the steps involved in purchasing Omni USDT? I'm particularly interested in understanding the process from start to finish. Would you recommend using a specific cryptocurrency exchange or platform? Are there any prerequisites I should be aware of, such as having a digital wallet or verifying my identity? Additionally, what are the associated fees and transaction costs I should expect? I'd appreciate a detailed explanation of the entire process to ensure a smooth and secure purchase of Omni USDT.