If you want Action Cam, you need to download here:
https://gametechmods.com/forums/downloads/?sa=view;down=179.
Once you extract the file in either WinRar or 7zip, drag both py files into your Arena folder of RA2 and replace the files. When you start a match within the game, make sure to hit both F3 and F4 on your keyboard to bring up the action cam at anytime. Remember that Action Cam works with any mod of the game, so you can use it with DSL or Ironforge, without any major problems.
As for adding more Areas, it's pretty simple. Just download any arena, extract the file, then drag the file contents into your Arena folder. From then, you should be able to select the arena through the arena selector in-game, and then you start having a fight or two within it.