Ha! I commiserate with you. My eyes started to glaze over after a bit. Here are some notes that may help out. They have changed the site around several times so, things may not be exactly in the place as documented, so you might end up hunting around the site. But, this should get you down the road a piece. Additionally, I am running Ubuntu Jammy, so their may be slight differences, I'm not sure.
https://send.vis.ee/download/2eab4ead88df4347/#gu-rOJkmSLWXn4v-EEe2Yg
https://archive.org/details/cloudflare-tunnel-setup-for-ubuntu-homelab-production
If the link expires or you want it uploaded elsewhere just let me know