[Map] Advance Map help - Events tab

Hello. I'm very new to the hacking circle, started yesterday on a whim. I've been through a couple of tutorials, including a very easy to follow Youtube playlist, however I am already stuck. I've tried to create a new map, and graphics/movement Permissions I have no problem with so far. When I clock on the events tab for my map however, no map appears so I can't add any signposts, NPCs, warps, scripts etc. Any advice would be greatly appreciated. I am using Fire Red as I hear it has more free space to work with than Emerald.

Save your map as a seperate file, then insert it in the slot. If you do it right then you'll be able to edit the events (as well as a full header)

Thanks very much :) :)