I'm from czech republic, so probably

guides: https://www.bitperia.cz has some guid for beginers, also bitcoinovej kanal on youtube

where to buy: Probably Vexl app, or bitcoinmat or geco (czech network of newstands. They accept cash for one bitcoin exchange. No KYC.

Store: Dont know how much they want buy for small amount some sw wallet, for anything else trezor.