A quote from the member’s guide:
“The versions of Fiore Dei Liberi’s Flos Duellatorum and the various editions of Hans Talhoffer’s Fechtbuchs are good starting place. George Silver’s work is also a must read”. And there’s this from the recommended reading list (medieval), "Secrets of German Medieval Swordsmanship - Sigmund Ringeck's Commentaries on Liechtenauer's Verse." or Sigmund Ringeck's Knightly Art of the Longsword By David Lindholm & Peter Svärd
What’s good to start with as a how-to book, or in what order would you go through these books? Interpreted English, mainly longsword. I want to start introducing info from specific sources into our new study group (all beginners). I have Codex W (haven’t read yet) and John Clement’s Medieval Swordsmanship.

