Nice collection and welcome to the forum!

I assume these are just a flavour of the collection. Those Silver Dollars are probably
the pick of what you have posted and that Austro-Hungarian imperial coin too.

As for the Euro coins they would have to be uncirculated with low mintage to be worth
more than their face value, there were just so many minted through the years, with
some years of various countries being lower mintages than others. Coins from the Vatican
and countries like Monaco or San Marino are always good.

Generally speaking old Silver and Gold coins will be the ones getting the most attention.