How created nomads weapons and armours?

>>1547544
Trading or raiding for it from nearby settled populations.
Requesting it as payment for mercenary work for nearby settled populations.
Relegating its manufacture to nearby settled or semi-settled groups that are within your cultural sphere (such as the Uriangkhai for the Mongols, or apparently Turkic peoples for Mongolic peoples in general - the Rourans referred to Turkic peoples as "their blacksmith-slaves", and blacksmithing seems to have eventually gained a religious connotation among pagan Turks).
Make it from materials and using techniques that do not require large fixed workshops or intensive resource extraction sites (such as Siberian peoples like the Chukchis and Koryaks, who made armour from leather, fish skins, and bone plates, all sewed together).

>>1547544
Same way anyone else did

>>1547567
Received wisdom from aliens?