Programming a Phantom (Can anyone help with TMK keyboard firmware?)

[xSpartanCx]

I'm having difficulty figuring out how to program my phantom. I'm using the TMK Keyboard firmware and it's really confusing. I want to use MXLOCK for my caps lock, and I want to have a function layer. I've got no idea on how to program this, and the github readme doesn't serve much help (I don't even know what files I should be editing). Any assistance is appreciated, whether a link to a tutorial, an example, or personal help.

[xSpartanCx]

Also, earlier I flashed some basic firmware to test the matrix. However, after just unplugging it and plugging it back in, the keyboard is not recognized. ?

EDIT: nevermind on this issue, my cable seems to be broken. :/