Request Help with Filters for ZWO ASI2600 MC Duo with Askar 130PHQ

I would like to experiment with filters. I have Optolong Lextreme and UV/IR Cut Filter. 
Should I use both at the same time?
What objects should I not use them on?

Looking to buy SHO filters as well.
Do I use all together, some together, one at a time?
Do I need to know which nebulae need which filter or filter combo?

How about RGB filters... Any way to DeBayer my 2600MC and make it function as 2600 MM?

Is there a go to Filter Resource knowledge base somewhere?
I understand Astrophysics, I'm new to Astrophotography.

Thanks,
John