Am I being overcharged by marketing agency?

Hi everyone. I’m a physician building my own private practice. Long story short, I’m looking for someone to: 1. Build me a practice site (nothing fancy, can be a template site but should look professional and easy for potential clients to find and contact my practice). 2. Maintain everything related to the site like security, hosting, and other stuff I’m sure I’m not aware of that are critical to ensure it’s running. 3. Build up the site on Google rankings for my location. I’m looking only for U.S./Canadian agencies that I can talk to, preferably locally but anywhere in the continental U.S. or Canada is ultimately fine. So I got several quotes from U.S. agencies. For all of the above (including 4,000 words of ghostwritten, human-written, SEO-relevant content per month) I was given estimates of anywhere from $5,000-$15,000 per month with a 12 month contract. Does this sound reasonable, suspiciously cheap, or way too expensive? What is a reasonable price to pay for what I’m looking for? Thanks.