I second Robins recommendations. If you check out our Books page, there are some great resources Dave Hunters book is great for starters and has a fantastic starter amp build detailed. If you are set on building your own circuit, I’d start with Marantz’s book. The Merlin Blencowe books are also awesome, but they are separated into one for we’re and one for preamps.
The circuit you posted has some interesting choices that we don’t usually see in a preamp. Typically we see two 12AX7s in series, like you have. But a cathode follower on the second stage is a bit odd. For a guitar amp.
What kind of application are you building for?