I'm trying to plan a book signing and live in a big city area and it's extremely hard to even set up a book signing. You have to be pretty big for it.
In my experience unless you are famous it's pointless.
I once wasted £20 on train fares, a whole 12-hour day of time and a huge amount of effort sitting in a bookshop that specialised in exactly the genre of my book. I was extremely grateful to be invited by the shop, as it was in central London.
I was surrounded by posters that took me hours to create, and a pile of my books, and greeted every person that entered the shop with a big, warm smile and an invitation to have a look at my book (browsing copies were left around invitingly) without bordering on pushiness.
I didn't sell a single copy. I went home feeling terrible. Not only at the waste of time and money, and an aching jaw from smiling all day, but the raised then shattered expectations, and the humiliation of it. I've never done one since.
I think that spending the same amount of time and effort on online promotion of your book might prove more effective!
Good luck