You already got some great recs, but I'm just going to go ahead and add a few of my own. I definitely agree that high quality silicone (make sure they're phthalate free) are good choices. I never had a glass toy so I can't say anything about those, but I heard good things.
I personally prefer toys with texture to those smooth ones. While the smooth ones are presumably closer to the "real thing", the textured ones will still do a fine job at opening you up, and I really love that initial "popping in" sensation, which you get several times with those toys.
I use one like this:
https://www.amazon.com/gp/product/B01IJYTJAA
Mine isn't a vibrator but a dildo, and the clit stimulator is flatter. Now I kind of wish I found the vibrator version first, haha.
It's obviously a toy for vaginal use, but the clit stimulators, while they prevent deep penetration, also prevent the toy from getting "lost".
The ridges are also very nice and soft, and feel heavenly. With small ridges like this I would only use silicone toys though. If the ridges are too rigid instead of yielding, I can imagine it could be pretty uncomfortable if they were made of glass, especially when you accidentally tighten up.
Smooth and bulbous textures should work for glass toys, though.
I just looked around and this one looks really nice:
https://www.amazon.com/gp/product/B00GN6IJ5I
If I ever try out a glass toy, this would probably be the one I would get. (Sheesh, what's with the pink and hearts though.

Looks like it's made for adventurous magical girls.)
I wish you a fun time, and feel free to write back about your experiences.
