Well, the problem was that I couldn't know if I was doing this correctly. There are no youtube tutorials and the few guides I saw just told me to do some things without showing it. I tried to follow it, but instead, it's brought me nothing but errors and crashes. I've been told I should not use modmerger and instead go through each individual thing to find what it changed, but that's also complicated by the multiple module types (Header, Module, Process, etc).
As for the errors, I have dug through the files to try them again, and I have caught the messages they wrote:
UNDEFINED VARIABLE IN: Depth
E:/Steam/Steamapps/common/Mount and Blade/Modules/Total War
And when it ends, it lists a ton of undefined variables.
Also, I'll look up Modsys' thread on it, but the guides were a bit vague on how it works. Do I have to do something each time I want to import the stuff? Also, how do I tell it to import from those two files? I renamed the Floris Expanded mod to just Floris for easy mentioning in the code, but I think that may be the problem. Thank you for your reply! I'll look to Modsys' guide now, but I'm not sure if I am smart enough to grasp this whole thing.