| 500K is the typical value for pots in a humbucker-equipped guitar, 250K for single coil, and 25k for active circuits. Yes, it does matter because the wrong value pot will give you a screwy volume range, like all of the control over a small segment of the pot's travel.
Your best bet is to contact the pickup manufacturer and see if they have some sample wiring diagrams, probably online. There are also a lot of good website with information on this and a little time in a search engine will deliver a good sampling.
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