How to transfer money to Gemini?

Hello there, I'm curious about how to transfer money to Gemini. Can you guide me through the process step-by-step? I'm new to this platform and want to make sure I do it correctly. Do I need to set up an account first? And once I'm logged in, what are the specific steps I should follow to deposit funds? Is there a limit to how much I can transfer at once? Lastly, how long does it usually take for the funds to appear in my Gemini account after I've initiated the transfer? Thanks in advance for your help!