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who we are and what we do sort of thing, with lots of pictures for the hard of understanding. A 'contact us' might possibly be helpful
That's almost exactly what my site does. KISS, don't pay anybody a lot of money. I've been with 1&1 (now called Ionos) for more than 15 years so I'd use their cheapest Business package as a benchmark at £5/mo., other people might chip in with whatever they've been happy with for more than a decade.
Why? I mean, yes, you need a Web site, but what functions does it have to include? There's a world of difference in the answers to the other questions depending on the answer to that one.