Hi Tom-
Welcome to the forum. I'm sure, in fact I'm positive, that you will find all you need to know about figs right here, on this forum. Keep in mind that Egyptian fig varieties may not do as well here, especially if the figs need a wasp for pollination.
You say you want to expand your collection by rooting cuttings, and that you'd like to grow about 50 trees. Fifty different varieties or, just fifty trees of any variety, including many of the same variety? If it's the latter option, buy a few stock plants and chop them up into cuttings, or air-layers, etc. From one tree you could easily propagate 20-30 individual plants of the same variety. In your climate zone I would make sure that it's a short-season, hardy, variety like "Hardy Chicago", etc. You can't go wrong by starting your collection with tissue-cultured, virus-free, fig trees from Wellspring Gardens, Florida Hill Nursery or, Hirts. Fig trees from Wellspring Gdns. are a bargain, and shipping fees are very reasonable especially for multiple-plant orders. Yes, they are small plants but they grow fast. Protect any trees that you purchase or root.
Check/Search all threads re: air-layering techniques, and/or propagation techniques from cuttings. You-Tube has videos showing both methods and also some videos showing propagation using green-wood cuttings. More than likely, you will be growing your figs in containers. Almost all fig varieties will do well in containers, but all varieties will not ripen figs in your area/climate. Check the "Figs For Your Location" thread for varietal recommendations.
I am sure by this time next year you will have all the fig trees that you need. Good luck with your endeavors.
Frank