The idea is simple:
You look up a weapon you want in the wiki and if I have a recipe learned, I can craft it for you. The price is materials + energy needed for work. If a unique variant is made that I'm interested in, I'll keep it and make you another weapon. Chance of making a highly-desired unique variant item is very low so you're not losing much (and you still get a chance to craft something when you go for 4-star item or 5-star item!)
Note that a 4-star weapon requires a level 5 3-star weapon for upgrade. Basically, only you can craft it since bound weapon is not trade-able.
You can find stats in the wiki (see top of the page - it has "wiki" button.

My known recipes:
-Swords-
Calibur **
Tempered Calibur ***
Cutter **
Striker ***
Heavy Hatchet *
Static Edge *
Super Slime Slasher *

-Handguns-
Frost Gun *
Autogun **
Prismatech Alchemer **

-Helm-
Cobalt Helm **
Drake Scale Helm ***

-Armor-
Angelic Raiment ***
Chroma Suit ***
Cobalt Armor **
Wolver Coat **
Emberbreak Armor *

-Shield-
Skelly Shield **
Scary Skelly Shield ***
Owlite Shield **
Emberbreak Shield *
Firebreak Shield **

PS: I collect recipes as a hobby :P
IGN: Round-Shinigami