Bravo @Kopusetic for wanting to do it yourself. I think more people should learn to work on their own instruments. But be careful… pots are a sort of gateway drug… before long you might find yourself wanting to built your own instruments.
As for linear vs log for volume pots, it’s a matter of personal preference.
Linear pots are good for doing volume swells or cleaning up distortion since a small adjustment of the knob (when near the 10 position) makes a big difference in volume. As an example (I don’t have the exact numbers, sorry) , you may have a linear pot that is 100% volume at position 10 but is only 20% volume at position 5. This is because our ears do not perceive loudness linearly. The linear pot at position 5 is giving us 50% of the pickup’s voltage but we hear much less than 50% volume. Our eyes though, do perceive light in a linear manner. So if this same pot was used as a dimmer for a lightbulb, when the pot was at 5 we would see half the light that we would when it’s on 10.
Log pots on the other hand have a tapered resistance so that their electrical output more closely matches perceived volume. In other words, the pot at 10 is 100% volume and at 5 it’s 50% volume. These are what most people prefer for volume.
But, since pots are pretty cheap, the best thing you could do is buy one of each and try them both to understand the difference between them and to decide which you prefer.