Right, so you're making theatre-production art to show concepts and stagings, and you need lots of clothes and hair available at relatively low cost. It sounds like you're too new to be diving into clothing/hair conversion across different types of figures. I'd thus suggest you start your learning with DAZ's Victoria 4, which works fine in Poser, and has the required wide range of clothes and hair at modest prices. You should also investigate Poser's "Sketch Designer" module, for making renders of poses that look "hand drawn" (sketched etc). Once you've learned the absolute basic of Poser with a familiar and tutorial-abundant figure like Victoria 4, then move on to take a look at La Femme - especially if you need close-ups to show stage actors exactly how they should should turn their foot or neck etc.

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Learn the Secrets of Poser 11 and Line-art Filters.