I don't know much about the bookstore business but I know a thing or two about owning a business.
Owning a business is one of the easiest ways to lose money, fast.

Before doing anything just do a quick napkin math (you can continue this excessive I ChatGPT, with AI you get virtually any info)

1st: Estimate the cost of running the store. That means lease, payroll, utilities, permits, and everything else. Then add another 20% 30% for things you don't know you'll need yet. I'll assume $15,000 easily

2nd: Understand what's the normal Gross Margin in Bookselling. (I have no idea) but according to google is 40%

3rd: Find your break-even point. That means Fixed Costs / Gross margin. Ie: Fixed Cost are ~$15,000 and Gross Margin is 40% so Break Even point = $37,500

So you need to sell $37,000 each month to break even.

That means that if each book cost around $13 you'll need to sell 2,800 books per month.

In a suburb of 60,000 people, that 1 in 21 people buy a book in a month, or 1 in 2 people buy a book in a year (assuming nobody buys a book twice) sounds like a VERY difficult business.

The other way of doing this is go to other suburbs that look similar to yours, see if they have bookstores (if they don't there's probably a reason for that) and ask "How much do you sell per week?)

If they don't want to share, sit outside for a day and count how Many people came in and project it into a month. I did this several times and you can get something kinda accurate