Normally, humbuckers are wired in series (between their coils) but pickups are combined in parallel (middle position on 3-way toggle). Coil split, series/parallel coils, parallel/series connections between pickups are all options, but it depends on how many wires your pickups have, and/or if you're willing to do some surgery on them if they've only got hot & ground.

Something like this is a good starting point:

If you ignore the split/series/parallel switches and master series/parallel, it's just a master volume and two tones. Then, depending on you pickup wires etc. you can add one or more of the other switches.

Alternately, you could just have master volume, two tones and then a switch to select between different tone capacitors etc. It really depends on what controls you normally use, and what you're likely to use if you had it.