The people of Kolkhis were for the most part Kartvelian highlanders (reading about the armies facing Pompeivs Magnvs in the east would be a start), some having however experienced a larger degree of urbanisation. While the coastal people had been Hellenised to a little. Here larger bronze-faced shields have been discovered, but there still would've been perishable materials used as armour too...
As far as archaeology goes axes and swords seems to have been the majority, plus javelins of course...
The Satevari dagger seems to have been a status symbol even back then...
There are indications for the possible use of wooden helmets and there definitely existed body armour made of flax...
Cavalry in Kolkhis proper wasn't employed particularly, at most mounted javelineers with hide shields...