What's better that a quick video showcase to see how it works?...

NODEGROUP SOCKETS

1. Diffuse Color:  is where your diffuse map or color output should go
2. AO Color:  is where your Ambient occlusion map should go (if you got one...leave white otherwise  )
3. Normal Color:  is where your normal map color output should go
4. Normal Strenght : This value will allow you to increase or decrease the strenght of your normal
5. Use Puddle Custom normal: This will define (when set to 1) if puddle should use custom normal instead of flat normals
6. Puddle Custom Normal :  is where your custom puddle normal should go if you maybe want noise on your water surface (rainripples?)
7. Displacement Value :  is where your displacement map color output should go
8. Glossiness :  is where your Glossiness or Roughness map should go (don't forget to invert it first if you use roughness instead of glossyness)
9. Use Custom Noise : This value define if you want to use custom procedural noise instead of displacement height based puddles.
10. Puddle Height Value :  is the Value that will make your puddle emerge from the ground (go crazy with the values, they're not normalized to allow more control)
11. Puddle Height Smooth :  is the amount of smooth transition between puddle surface and non wet part of your material.
12. Puddle Roughness Value : is the amount of pure roughness on your puddles
13. Puddle Diffuse Color Multiply: This will define the color multiplication of the diffuse trough the water surface.
14. Mud Amount : is the amount of mud you will want to add to increase realism to your puddles
15. Mud Smooth : is the amount of smooth transition between mud inside the puddle and the puddle itself
16. Mud Diffuse Color: basically the mud color
17. Base Wetness : is the wetness amount you can add to your non puddle part in the material (it can help to reach the result ;) )
18. Displacement Water Height (CYCLES ONLY) : is the height of the water plane in your material
19. Displacement Scale  (CYCLES ONLY) : is the amount of real displacement that will be applied to the material when using microdisplacement
20. Displacement Midlevel  (CYCLES ONLY) : is the Midlevel point of the displacement, basically defines the ground zero.
21. Custom Noise Scale : s is the scale of the custom noise if you decide to use it instead of displacement based puddles
22. Custom Noise Detail :  is the amount of detail from the custom noise based puddles.
23. Custom Noise Dimension :   is the Dimension of detail from the custom noise based puddles.
24. Custom Noise Offset:  is the 3D offset of your custom noise based puddles. use it to randomize puddles between different objects.
25. Clear Coat Roughness: is the roughness value of your clearcoat layer on top of the puddles.

If you got any question don't hesitate to contact me , i'll add it later in the FAQ section .

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