General advice + pls help valuing these coins

Hello, a relative passed away and I am doing some order in a major amount of mess. He was collecting everything from hotel signs to … you can't imagine. As a big traveller, plenty of coins. I have to admit numismatics bit me a bit. All this to say, I am a complete starter in numismatics. 

I found Numista and use their rarity index. What rarity index do you suggest to keep? What should I certainly discard? 

I occasionally find 85+ coins or banknotes, and some over 95+! Exciting :) Can you pls help me for instance valuing these coins? 

Sorry for your loss.
Keep what interests you but please don't use the NRI as an indicator of real rarity, and don't equate rarity with value (it's not always the case).

For example the objects in your picture are not coins they are replicas (LINK) as you might have guessed by the reverses, might have a high NRI and might even only be produced in small numbers. But coin collectors usually don't collect replicas so the NRI will be high because only a few members would even add them to their collection and their value is often low regardless of their mintage because of lack of interest.