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FIR filters are very complex and I haven’t found so far any good and simple whitepaper. Best paper at the moment (if you’re about to dig it deep) is the one I have in my mini tech library – http://3s.lv/tech/Design_of_FIR_Filters.pdf
Basically you use software like FilterShop or MathLab to make a filter model and export coefficients file. Most of signal processors and amplifiers will not allow you to design the filter directly. For example I have Powersoft amplifiers and that accepts only imported coeffs. So far I had only one situation where I actually needed FIR, mostly All Pass is enough in my setups.