The firing order is 1 2 3 4 with 1 being the passenger side. Aveos don't have distributors, so the other end of the wire shouldn't give you much trouble.
What is the firing order on a 2004 chevy optra
Cylinders are numberd across 1, 2, 3, 4 (not sure left to right or right to left). It is easy enough to find out because your spark plug wires should be numbered too (1, 2, 3, 4). the longer wire will be for the far side of the engine then set them in place from there.
Your only concern is the distributor side. Look for numbers molded into to the plastic (1, 2, 3, 4). Might need a flashlight and a small mirror. Hopefully, they are there.
Good luck.
-Mark
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