I'm confused as to how I go about building my website. I've got a bluehost website with wordpress. I know nothing about any of this so might go ahead and just pay someone to do it.

With this kind of setup is this something I can do without knowing really anything about it?

What's a theme and why are there so many?
Can I build a site with just a theme and wordpress?
Do I need a theme or can I build a site with just wordpress?
I had a theme but then needed to purchase elementor or some kind of page builder. Is this required to build the site?
All these themes seem to require some kind of page builder with them. Is this something I need to buy or do some of the themes come with their own page builder?

I just want something basic. It doesn't need to be fancy. There's just way too much information on this with many different themes that change from year to year with which is the best.

Can anyone simplify this for me?