I've just completed my first job for a designer putting together her collection for a show this spring, it's been way cool. And I can't wait to work on more, jumping into this field is the best thing I've ever done. Word of note to any aspiring pattern makers out there though, yes you can edit Lutterloh patterns to create either you or someone else's designs however what you really need to do is learn patternmaking from the ground up.
My suggestion is to get yourself Connie Amaden Crawford's book, Patternmaking Made Easy, and some real pattern makers tools. This book is a life saver, everything you need to know to seriously get started in professional patternmaking. It's easy to read and understand, step by step instructions and nicer line work illustrations than the other pattern making book I had (Armstrong, that I didn't use because it was so daunting).
The rulers and at least the pattern notcher, 18 " curve for sleeves, curve stick for hip curves (and more) and a L curve, don't fight inaccuracy alone (I tried to with just a plastic sleeve curve and a side of poster board as a straight edge and a little protractor, don't do this to yourself, save your time and get your rules!) French curves are good too, but I winged it without them. GoldenStar tools are where I just ordered my new equipment.