To upgrade a Weapon lvl 1-4 you need the Skill Weapon Refine. Here is a Skill tree :
http://www.rocards.de/calc/whitesmith.htmHere a link for the chances :
http://www.rocards.de/Upgraden.rcTo make elemental Weapons you need the skills: Smith mace,smith axe,..... (link above: skill tree you can look)
To make VVS you need

Star Crumb (can easyly get from Miyabi Doll

)
Then you need a Iron or Oridecon or Golden Hammer (each Weapon has another hammer) you can get the hammer by the blacksmith npc in prontera (left of the weapon shop). The link what Weapon needs what hammer :
http://www.rocards.de/Schmieden.rcthen you double click on the hammer und you can choose which weapon you want to make. click ok and you have now 3 empty fields vor 2 or 3 Star Crumbs or 2 Star Crumbs and
1 
Flame Heart
or 
Mystic Frozen
or 
Rough Wind
or 
Great Nature.
I hope that helps you