Depends what you want. If you want to start trading tf2 items its probably best to get some currency items like keys or refined. You can use sites like backpack.tf as a guide for the price to expect. If you are mainly plaing the game I wouldnt care to much about the trading part as it can be cumbersome, time consuming and - similar to bitoin - its full of scammers and phishing software/trojans.
Both, IIRC its: two weapons -> 1 scrap; 3 scrap -> 1 reclaimed; 3 reclaimed -> 1 refined; 3(or 4?) refined -> 1 random hat.
There should be a list of blueprints in the inventory section.
Crafting is mostly a mechanism to destroy value though. Since trading started, items that are valued in metal have lost value constantly, while items that are valued in keys stayed the same. This is mainly because you only buy keys, while metal and weapons can be farmed with bots and their is no limit to the supply. E.g. a few years ago a key was worth 2.33 refined (2 refined + 1 reclaimed) now its more than 7 times the amount of metal for a single key. While the game itself is not pay to win, trading is very hard if you are not willing to invest into keys one way or another.
Btw the key I bought should be about ready to be traded, Ill check for your taunt tonight and add you on steam.
Also, I'll PM you about that now.