I'm looking for something that shows how much it would cost to craft a item / bag or similar in my proffession window depending on the auction house prices. Or something that shows the profit from doing it.

Is there anything like this out there? Just got back playing again.

Aaaaaaannnd boom:

https://www.tradeskillmaster.com/

http://www.curse.com/addons/wow/tradeskill-master

"TradeSkillMaster (abbreviated "TSM") is a modular addon suite designed to help both casual gold makers as well as experienced auction house goblins streamline their gold-making processes including everything from crafting things to buying mats to snatch (dealfinding) lists to creating and canceling auctions. "

And to go w/ it

http://www.wowuction.com/#