Tick a recipe when you've learned it. Type how many you want in the Make box and that row's materials, craft time, cost and profit multiply to match. Click any material to type your own price for it (handy when the AH moves); it changes that material everywhere. Cost uses the cheaper of the auction house and vendor price for each material, unless you set your own price on the Materials tab. Profit is what a vendor pays for the crafted item minus the cost: profit within 10% of break-even loss no figure yet
Needs Tanning Rack and Needs Sewing Machine mark recipes that need that tool nearby (70 recipes). Every recipe new in Forever was checked on Wowhead; original Classic recipes need no tool. Use "No tool needed" to hide them.
AH prices are the median at the last scan for the server group you picked. Type your own price (like 4s 50c or 1g 20s) to use it instead; clear the box to go back. Vendor prices are the base price before reputation discounts.