Hm. I'm not sure what "non-penetration" means, but my best guess would be that they're just trying to emphasize "closed-end" (that is, the onahole isn't penetrated straight through).
ToysHeart is pretty well known and they make some good products, so I'm somewhat surprised that you were disappointed by it (especially at that price, damn). That being said, I'm not sure that all of ToysHeart's products are top-notch; this one in particular is rated three stars on NLS, and I've never seen a review of it, which makes me think it might not be that great.
I believe "Open My Pussy! Rina" (https://blog.onahole.eu/open-my-pussy-series.html
) is one that AkaiHebi often recommends for first-timers. "Seventeen Bordeaux" (https://blog.onahole.eu/age-series-seventeen-bordeaux.html
) might also be a good starter (was rated 10/10 back in the day), but I don't know if it still holds up in the face of new technology (I have one and find the stimulation rather low). Also, I think everyone has somewhat different tastes, so it may turn out that you prefer a specific style of onahole; that could take a little bit of experimentation.
It's hard to use an onahole incorrectly; you just stick your dong in and move it up and down with your hand like you're fapping (you can do other things too, like strap it to a dakimakura, but that's more involved).
I'd recommend picking up some lube as well; AFAICT, most people prefer to get their own bottles of lube rather than use what's provided (you only get a small sample, anyway). I personally use Golden Lotion (https://blog.onahole.eu/golden-lotion.html
), but you can look up the various reviews and decide what you want. Also, a USB onahole warmer (https://blog.onahole.eu/new-usb-onaho-warmer.html
) is quite nice to warm up the onahole beforehand; you can warm it for a few minutes to get it to skin temperature, or leave it in for longer to get a very pleasant hot feeling upon insertion.
By the way, when you want to buy things, you should take a look at the different websites they're available on. In this case, I think Amazon and NLS (with shipping) come out to about the same price (it's $40 at https://en-nls.com/pict1-11779?c2=9999
), but in general I think NLS has the lowest prices. Also, if you want something from Amazon Japan, you can ask them to include it, and they'll buy it in Japan and include it in your order (which may save you some money on shipping, I think). English-catering websites like ToyDemon, etc. generally have an extreme markup. The review pages on this blog also list prices on various sites, so it shouldn't be too hard to find the best deal.
One last thing, this guide should be a good help if you want to read more (linked on the blog): https://www.omochadreams.de/downloads/Omocha_Dreams_Onahole_FAQ_multilingual.pdf