what should be the resistance of a set of wires..... does it go by the foot, or something like that

I want to test my wires and wondering what is acceptable for each wire

Should be around 1000 ohms per foot. Bit lower for performance wires.

Thats what I have read too, what is the acceptable precent error?

Less than 10% per wire. You start running into intermittent misses at about 15-20%. And at that point, it starts looking for another way out. (short through the insulation to the nearest large mass of cast iron).