Thanks for the recommendations guys. I will get the 1500 diamond stone instead.
I’m fairly certain I will have the depth key, at least it was shown in the pictures of the ebay post.
As far as strops go, i’m hearing a lot of different things about which ones to get. Some say leather, some say balsa depending on who you ask. I’m kind of thinking to go with regular leather or balsa, and ‘upgrade’ to kangaroo at some point once my technique has been perfected. Where do you guys think a beginner should start for stropping? Assuming 100-1500 grit diamond stones and perhaps glass with lapping film.