Betta Fish: Thinking about getting a betta

I’ve decided that I want to get a betta fish. I’m still learning and don’t know much yet, so I have a lot of questions before I buy anything. I want to do this the right way and make sure the fish has good living conditions. I’m thinking about a 5–10 gallon tank, but I haven’t seen the sizes in real life yet, so I’m not fully sure how big I can go, hopefully I can get a 10-20.

I want live plants in the tank, but I don’t know what plant care includes. Do I need to trim them, add special stuff to the water, or do something often? I want something simple and not too time-consuming.

I was also wondering if I can add one or two of those small shrimps or maybe a snail (They help cleaning the tank correct?). Are they safe with a betta fish? How do you take care of them and are they hard to keep alive?

I don’t know what kind of bottom the tank should have either. Should I use sand or small rocks? What plants would you recommend for a beginner? And what exactly do I need to buy for the tank to work properly and so the betta won't get fin rot.

I also want to know how often the tank needs to be cleaned and how. Is it something you do every week, or just a small clean sometimes and a bigger clean once in a while? I want something that is easy to manage and doesn’t take too much time.

The two photos I uploaded are something I'm going for? Im pretty sure the 2nd photo needs more hiding spots. Please lmk!

My first language isnt English so pleaseee use easier words lol. Some of the terms I've come across here on reddit are crazy

Thanks!!