If you're in the US, you may want to consider joining the American Bookseller Association or a regional bookseller chapter. It isn't absolutely necessary and there can be drawbacks, but there are definitely benefits. Membership allows you to take classes or go to conferences specifically about opening/running a bookstore. They can help connect you with reps from publishing houses. They host conferences that have vendors and authors and sessions and networking that are super helpful...there is also something called the Bookstore Training Group that people recommend. I know some who have actually gone to the in-person "bootcamp" and some who have done the books on their own, but it comes recommended by everyone I know who has done it...if none of those options appeal, try reaching out to bookstores for general advice. I have been loosely planning on opening a bookstore in the future, and when I travel, I email local indies ahead of time and ask if I can set up a meeting with an owner or manager. I always offer to pay for their time or take them to a meal afterwards. Sometimes they offer help but don't take payment. Other times we end up having a nice lunch somewhere. Some people say no. But it doesn't hurt to ask and booksellers in general have been super nice and accommodating and want to see others succeed!