the rabbit hole is deep indeed. I wish you success and enjoyment. btw the zwo 120mc are currently a usb3 version and i've heard a bit better imagers than the original usb2 version I've got. So you will find a price difference between the two on the 2nd hand market so I'd look for the newer one if you dont buy new (which should all be newer version). I guess you could go for the 120mm (mono) instead but starting out the colour is what I craved and might be better for your efforts. but with a budget thinking hat on, the mono will make a good camera for guiding better than the colour version. So depending on how fast you learn and progress. I dont recommend diving in and get everything right now. so slowly and spend wisely. I upgraded and use my 120mc on a solar scope now, it was also fun to experiment modding it by adding a peltier to it for cooling, no obvious difference in the images than without it. also grab SharpCap (also free), I just prefer firecap and both have pros/cons. zwos cooled versions are really good performers if you can afford to stretchthe budget a bit, maybe next cam?
No gear is ever good enough. Other free software to grab: PIPP, AutoStakkert, DSS(though I think maybe a reducer might be a good idea for those wider starfield shots, I use DSLR for mine so no need there Only imaging I do through a scope is planetary with zwo).
PIPP is great for imaging planets, run your capture video through it and center object and maybe crop frame and get pipp to output bmp series or avi to drop into autostakkert which aligns stacks stretches sharpens planetary/lunar nicely. its great to get your target planet closely aligned in the frame like a well guided set up does. Youre likely to have drift to iron out so pipp helps you out to not throw away captures in frustration.