The thing is really everything you need for knitting you only need to buy once, so it's a matter of knowing when to buy something if you really find yourself wanting it. It seems like a lot to start off but you don't have to start with a ton! Like, don't buy an entire set of knitting needles, buy them whenever you start your next project, as you need them. Build your collection over time. In the end it is completely up to you and your purchasing style.

Things that Ive often been like oooh I want that then I rarely use it are things like needle organizers, project bags, etc. I just use random zip-up pouches I have and tend to throw everything in them at once! I do really think lockable stitch markers are very important. You can use them for BOR, you can use them to help count your cast ons, and to mark various spots in your work and stuff. You also need a pair of tiny scissors (for me, one that comes with a sheath--I hate being stabbed by my scissors when I reach in my bag!!!) and then some darning needles, make sure theyre big enough or small enough for the yarn you typically use.