Hello, i recently aquired some schematics for witcher swords (in Velen) but when i visit any blacksmith, i can't see those schematics in the menu.

Check your crafting menu filter. I think crafting objects above the blacksmiths ability level are filtered by default. For the basic Witcher sets you'll need to find a blacksmith who is at least a journeyman.

I think i see it need master blacksmith. So there is only one master for weapons and one fo armours, in game? To craft master-requireing armors i need to first advance story to go to Skellige islands? I'm level 11 and doing sidequests mostly and got some withcer sets schematic, gryphon i think, that would be good for my level, but i think i am quite far behind with main storyline .