i've found the upgrade to silver sword of wolf armor set, to make it i need a regular one, but i dont have it, and if my memory is correct it's not the one we started a game with, or am i wrong? beacouse then i'll start to wander from shopper to shopper, from swordsman to swordsman and try to find that sword :D
long story short. where i can find a basic silver sword of wolf armor set?

you need to find the schematic, blacksmiths and armourers sell them.

http://www.gosunoob.com/witcher-3/witcher-armor-wolf-school-gear/

thx, sooo first i have to go to kaer moren,
i'm still on skellige :D

Yeah, most of the Wolven gear is in Kaer Morhen, although some of it is in Skellige also. If I remember correctly, the armorer in Hierarch Square has some of the wolven gear diagrams for sale, and one of the ones at Crow's Perch and then I think also the blacksmith at Lindenvale. Explore the crap out of the entire Kaer Morhen map the first time you go there though - do every quest you're high enough level to do and explore every nook and cranny. :)