I just got my tablet almost a year ago. I use the Wacom Bamboo Pen model, and I think it's a great one to use for beginners. It's pretty small, but it works really great. It has a pen and a USB, however it has no fancy buttons or anything. That means it also doesn't have an eraser. I believe there are similar models with erasers, but I'm not certain. You can enable pen pressure, and it should work with most programs, including Oekaki.
Remember that it's not always a good thing to just straight up and buy the fanciest, most advanced thing ever. You probably want to start with a cheaper, smaller tablet in case you end up not liking how using a tablet feels. In the case of my brother he ended up not liking using a tablet very much, so it's a good thing he didn't buy the most expensive model.
I really don't know much about my tablet because it was actually a hand-me-down from my brother who grew out of online art after making a snap decision to buy a tablet. Lol sorry. I hope I at least helped a little. <3
