Rules and tips dimension

Hello, I'm pretty new to datapack stuff so I am sure what I want to create is pretty complex. I've seen stuff like a creative mode dimension done before, but what I want to create is a dimansion that you can access with a /trigger command at any point. It is a superflat world that will always tp you at 0, 0, and it will make all players invisible an unable to collide with one another as this dimension just serves as a display for the rules and tips on my server. The reason I want to make this this advanced rather than text is to use map art to show certain things that can be done on the server since it is vanilla+ for Java and Bedrock. I want the pack to save the coordinates of where the player was in their previous dimension, and also not allow the player to teleport when taking damage, so that the teleporting has no advantage to a player besides to simply see the rules and tips.