

Just yesterday I created !printmything@lemmy.world for this very purpose, so I’ll plug it again. Well, not miniatures specifically, but rather a place for people who haven’t got printers to ask for help from people who do.
I’m not in Oz so I figure shipping to you would be quite prohibitive. But you might be able to connect with someone in your country, who can ship printed stuff to you more cheaply and – importantly – without having to fuck around with customs.
The go-to wisdom is that detailed miniatures are best printed with a resin printer. You can do it with a traditional FDM (filament) printer but it’s harder to get the small details reproduced, and FDM printers can’t print in midair so you either have to be very careful to take that into account with your design or do a lot of work with removing and doing the finish work around printed supports. So you probably want to find somebody with a resin machine.
If you’re really keen on getting a possibly non-running used bike as your first, I would definitely recommend sticking with something that’s a single cylinder for simplicity, and probably something that has a carburetor rather than fuel injection, because mystery carb issues are easier to solve than mystery electrical issues, especially given peoples’ pathological predilection to getting mystified and intimidated by wires. That’s not casting any admonition on your personally or your skills, but rather a prediction that you won’t get much decent advice from punters online as soon as your problems are found to be electrical and everyone either immediately tunes out, begins spouting absolute bullshit, or both. Conversely, there is always the nuclear option for a carb which is yeet the entire thing into the fuck-it bucket and just replace it.
The Honda Super Cub and its myriad derivatives (which, surprisingly, encompass both the Grom and the Monkey) is a popular option. The new ones are fuel injected and computerized, but the classic Cubs have carbs. You can get Chinese clones of these for not very much money, also. If you really want to wrench, a Chinese bike will offer you no choice…
Also consider a Suzuki TU250 which is sort of the quintessential standard beginner’s bike, or possibly an old Honda CB250.
If you’re confident in dealing with a twin cylinder bike, the other obvious suggestion everyone will offer is the Ninja 250 (the older ones are carbed, but have two carbs rather than one) or Honda CB350, which is also a parallel twin. The Yamaha V Star 250 is also a small V twin, with a fairly light weight.
The height of various motorcycles is a perpetually contentious topic, especially when offering advice to beginner riders. Some people will insist that shortness can be overcome with skill and that one should just practice and git gud. Other people will say that you should eliminate a variable and a lot of anxiety by getting a little bike that you can easily flat-foot as your first.
I have no input in this. Get what makes you comfortable.
However, I will recount what we did, vis-a-vis myself and my wife, and trying to find a motorcycle (not a scooter, which she already has one of) that she could actually sit on. We found that the obvious answer, the Honda Grom, was actually too tall for her. We settled on a Suzuki Vanvan RV200, which she can sit on and get both feet on the ground. (It’s third from the right in the banner image at the top of this community.) This was available in both 125 and 200cc guises, but I don’t think the 125 was ever sold in America. It was sold in Europe where they have tiered licenses with a 125cc restriction, though.
Edit to add: I would really advise against getting a non-running bike as your first motorcycle. I get the appeal of wanting to tinker with it, but it’s all too easy to wind up with something that’ll be both a basket case and a money pit, and learning to ride on something like that will probably be more frustrating than it’s worth. If you want a project, get one as your second bike. Also remember the Ironclad Law Of The List of Craig (and also Facebook marketplace): Any time some asshole says “all it needs is x, y, z,” that’s never actually all it needs. If it were that easy, the loser selling it would have fixed himself it and he’d be selling it in running condition.