What programs do you have available?
Modelling requires 3dsMax which is very expensive to buy (maybe cheaper if you're a student)
Skinning / changing faction symbols needs a 2d graphics program. Photoshop is good but relatively expensive. GIMP is available free but is a bit harder to learn.
Scripting / changing availability of existing units / changing names of factions etc. just needs basic text editor like Notepad.
Also do you have an idea yet what sort of mod you want to make? The best idea is to start by making only small changes btw....
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