Advice on working with planetary pentacles?

[ElectricEgregore]

With the pentacles I always end up getting a little over stimulated as so many ideas come to mind on what pentacle to use for which outcome.

What are the best classic and maybe also the more in depth resources on the planetary pentacles?

How are you using them and would you also work with more than one to combine effects for certain goals?

Have you worked with the related entities that are sometimes named with each planetary pentacle?

When does it make more sense to work with the planetary powers "as a whole" instead of with the first, second and so forth pentacles?

I think the Kamea's or magic squares are a fitting aspect to combine these with?

Thank you for your insights!