If you want to build a sense of community you could try have some sort of service/event where people can come and learn and discuss cryptocurrencies.
Yes! I forgot books. Definitely sell some of Andreas Antonopoulos books. I haven't read them personally but I've heard nothing but good feedback on his books Mastering Bitcoin[1], Mastering Ethereum[2](pre order), and The Internet of Money[3]. Pick some up and sell em on your store; they'll probably grab some attention from the readers.
[1] https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388
[2] https://www.amazon.com/Mastering-Ethereum-Building-Smart-Contracts/dp/1491971940
[3] https://www.amazon.com/gp/bookseries/B075VG4NTN
Links above are non-referral links. All from https://antonopoulos.com/books/
I've not read them cover to cover but have a little and again have always heard good things. You should definitely look at getting beginners books instead of books for more experienced people, in fact I'm not sure quite how many there are.
A few books for beginners in the store window will really attract some passersby.