All the above is GREAT advice Jed
You'll get your start, don't stress yourself over it. It all starts with one machine or two. It does seem like good stuff is still out there, maybe not as plentiful as it was 10 years ago or more, but it depends on what you consider "good stuff" and how old that is.
Once you do get going, even a little bit, I have one piece of advice to offer: If you see something you like, take it and don't linger on the fence. Many times I've seen something, even on the side of the road, etc. that I wanted, and after I putzed around, it was gone when I went back.
Here's how it started with me....Back when I was in high school, I fixed my mother's Kenmore on the back porch, after the Sears repairman had told us it needed a new basket drive. The repair quote was about 75% of the cost of a new machine. Mom ordered a new one, but I wanted to keep the old one, so I bought the part at the Sears warehouse and figured I had little to loose. It turned out great and the fever started. After that success, I was telling my chemistry teacher about the fun I'd had and the money we'd saved, and he said "Oh I haul back all kinds of stuff like that for Sears on weekends deliveries. There's more where that came from if you want!" So I exuberantly told my Mom, and she sternly said "Not in our house you don't!!!!" My Dad would not over-rule the verdict. Eight years later I had my own house, and knowing I'd have a place to do what I wanted without anyone's disapproval, I bought two scrap machines for $10 that I hand-picked and began puttering with them.
The fun I had with those led me to wondering where I'd get more, and I worked out a deal with Sears (long story). Within a month or so my friend/mentor and I had more machines than we could handle, for free. I would never have planned on that happening, it just did, and something tells me the same will happen for you too - just be out there where you'll see them when the time comes.
Working at a used appliance store, or with a repair shop could be a boost? They may even have temporary storage space for you....just a thought.
Good luck Jed!