Ok first, for 300 cap FA you need to do the Triage quest, I'm not gonna post the link, just go thru the menu on the left under tradeskills. Actually now that I think about it, all of the info you need is over there, but I'll go on. Heavy Silk you have to buy a manual to learn, same with Mageweave, they're both in Dustwallow Marsh at the Horde OP that has the FP, or in Arathi Highlands at the castle with all the Syndicate guys if Alliance, I dont remember the names, again the links for more info under tradeskills tab. You *might* find them on AH but doubtful, for whatever reason the 225 cap manual is usually there but not the recipes. For Heavy Mageweave, Runecloth and Heavy Runcloth you have to learn from the Doctor that gives the Triage quest. For Alliance he's in Theramore, for Horde he's in Dustwallow. GL in your search.