How do I register for APRS?

Hello there, I'm curious about the process of registering for APRS. Could you please guide me through the steps? I'm new to this and would appreciate any detailed information you could provide. Is there a specific website or platform I need to visit? Are there any prerequisites or documents I should have ready before I start the registration process? Additionally, how long does it typically take to complete the registration and gain access to APRS? Thank you in advance for your help.