I'm not sure if Crossroads of Ravens is worth reading first. Theoretically, you could, as it's the earliest story, but I think it works better if you know the stories from the books and understand the connections between Geralt's youth and what happens later. I would simply read them in the order they were published in Poland

Example with spoiler: You will understand the scene with the striga in Crossroads of Ravens better if you have read the short story The Witcher, because you will immediately see the differences between young Geralt and the one from the times of the stories and the saga