I don't have any specific links, but ISTR that INCOSE has a lot of publications & recommended practices, etc. However, nothing beats working with an experienced Systems Engineer (as in: someone with a degree in Systems Engineering who has practiced it for many years) if you have the opportunity. I learned something every day working with those guys. https://www.incose.org/ProductsPublications/Papers-Presentat...
[pdf] http://disi.unal.edu.co/dacursci/sistemasycomputacion/docs/S...