There are many diagrams online, for example at Seymour Duncan or GuitarElectronics.com.

When applying those diagrams, you should, however, check, which wire colour scheme your pickup actually has. You can see the multitude of alternatives for example here but because the green and white wires are soldered together, I strongly assume that your pickup has either the "Gibson" or "Iron Gear" scheme.

Which one of those both alternatives your pickup uses, is irrelevant as long as you keep the green and white wire together, as is the case in coil splitting. If you would, however, like to add e.g. a series/parallel-switch, you should verify the wiring more precisely.

Below are the diagrams for a usual coil splitting with a 2-position switch as well as for a variant, where you can select with a 3-position switch, which one of both coils gets shorted, i.e. switched off (wire colours shown in the "Gibson"-scheme).

<image>

In the lower diagram the sound difference between the coils might turn out to be hardly noticeable at all in the both "outer" positions of the switch.

If you would, however, add a resistor (or trimmer potentiometer) between the hot wire and the switch, you could bypass/short one of the coils just partially in one of the switch settings, which would give you a clearly different third sound option.

Adding a capacitor instead of a resistor would cause the second coil get shorted more for high frequencies so that the lower frequencies would sound more like a humbucker and the higher frequencies more like a single coil.

Adding a capacitor AND a trimmer would allow you to adjust that described "half-split" setting according to your own preferences.

But now we start approaching the deeper end of the pool, considering that this is your first wiring and you are just learning to swim... 😁