There really isn't a right answer to your question, it just depends on the sound you're going for and what will get you there.
The value of the volume pot will determine the impedance the pickup sees. A higher value (like 500k Ohms) will make the pickup a little brighter, while a lower value (like 250k Ohms) will make it sound warmer.
The value of the tone pot will effectively determine how high you can turn up the tone. The tone pot just acts as a variable resistor in a guitar circuit, so they all sound the same at '0'. However, if you're using audio taper pots, a 500k pot on '7' or so should sound the same as a 250k pot on '10'. The lower value gives you finer control, but the higher value will be brighter on '10'.
The value of the tone capacitor determines how much of the upper frequencies get rolled off. A smaller value (.01 uF) will just roll off the very top end as you turn down the tone knob, leaving you with full upper mids. A large value (.047 uF) will roll off a lot of top end and some upper mids as you turn down the knob.
Since single coils tend to be bright, many people use 250k pots with a .047uF capacitor to make them a little warmer. Conversely, since humbuckers tend to be warmer, many people use 500k pots with .022uF capacitors to keep them bright. The fact is there is no magic formula. It’s just another aspect of the guitar’s signal chain that can be tweaked to taste. The good news is pots and capacitors are cheap, so you can buy multiples and experiment! I like to hook up a guitar with alligator clips and try different values until I find a combination I like, and then I’ll break out the soldering iron. I generally like a pretty bright sound because I can always roll the tone knob down, so I usually start with 500k pots and a .022uF or smaller capacitor. If I’m trying to combine a bright pickup with a warm one in the same guitar (like a Tele bridge pickup with a neck humbucker), I sometimes throw an extra resistor or tone circuit in parallel with the bright pickup to warm it up without affecting the other pickup. Sorry this is so long-winded. Good luck!
