Familiarize yourself with SysML (also see OCSMP certification). Get a copy of SysML Distilled by Lenny Deligatti to start with, then get Practical Guide to SysML by Sandy Friedenthal. You could skip Lenny's book, but I think it's better for beginners because Sandy's book can be a little overwhelming at first.
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Cameo has a pdf called MagicGrid Book of Knowledge as another guide you can follow on.
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