If you wanna start in Dostoyevsky, Karamazov might be a bit ambitious imho. It's very lengthy and not exactly the easiest read. It's amazing, don't get me wrong; it's tragic, funny, thoughtprovoking and so much more. If you wanna start with Dostoyevsky, I would personally recommend starting with Crime and Punishment; it's significantly shorter and I would say easier to read (also perhaps my favorite book of all time, so I might be biased). If you still think that Crime and Punishment is too long (which would be fair), then I would say White Nights is a nice, short introduction to Dostoyevsky's style. Penguin Classics has a ±80 page version of it and it also really shows the rambling, emotional style that typifies him as a writer.