iam not a electronics person so my under standing of what drifrent types of restors are.
im going to be useing a g540 i have two amp steppers so i need a 2k restors do i get a restor that is could a 2k restor or what as dont what to get wrong type and bugger the g540 or steppers
Resistors are generally sold with "standard" values, which are accurate to within a stated tolerance.
2000 ohms (2K ohms) is a standard value for 5% tolerance resistors.
It also happens that 2000 ohms is a standard value for 1% tolerance resistors (which would have a good chance of being even closer to 2000 ohms than any randomly-chosen 5% tolerance resistor, but I wouldn't get too hung up about it).
So, if you can find a 2000 ohm resistor with 1% tolerance it would be great, but if you can only find one with a 5% tolerance it should be OK as well.
Resistors are also rated by the wattage that they can handle. In this application, the resistor will not need to handle a high wattage, so a resistor rated for 1/4 watt should be fine and should also be easy to find in any electronics shop.
(If for some reason you can't find one in the 1/4 watt size, it should be OK to get one anywhere within the range of 1/10 watt to 1/2 watt, but the smaller wattage resistors will be easier to solder to the connectors than the higher wattage ones).