Welcome to the site

I think either a ball python or a boa would be good to start out with, however, research as much as you possibly can before jumping into either. They are very different species, and both have pros and cons.

I'm more prone to say a ball python would be ideal to start with. They do not get as big, and are considered the "gateway snake" haha. You have to be aware that boas can get very big, especially females. It's rare, but some females can exceed 10 feet. You have to be prepared for that physically and financially. Big snake = big food, big cage.

Here are the caresheets that this site has to offer. Both the boa and the ball python are available.

As far as the plastic tubs, I use them in my DIY rack for my boa and my ball pythons. I prefer them over tanks because they are easier to clean and maintain proper husbandry. There are endless DIY options on this forum. Don't hesitate to ask questions.

Good luck! I hope I helped some