This is a prefab containing all the necessities to adding Capture the Flag gametype to your map. It includes all the triggers, flags, models, AND spawn points you need to get it working!!! Now, of course, you will probably want more than just two spawn points for each side (I only include 2 per side) but I think you can all do that on your own! However, if you import this into your map and put the bases where you want them, you should be able to test. You can move the spawn points whereever you want, and you can also move each base wherever you want, I'd recommend keeping the 9 entities (not counting spawn points) that make up the base together, however, otherwise you might run into some problems.
READ THE README!!! It explains why you might be having trouble testing! Oh, and by the way, you are welcome! :)