Try
world coin gallery - most commonly encountered world coins are listed in Don's database. Unfortunately, he doesn't give metal content, and his "values" page is an average for the type and doesn't mention scarce dates or mintmarks. Don's also got some newbie ID help pages to help identify the countries.
NumisMaster is the website run by the same people that put out the "oversized book". Their "find my coin" feature is free to access for composition, though it's cumbersome to use (especially for Firefox users) and if you want mintages and catalogue values, you have to subscribe.
As for your coins, I looked them up in my 2006 edition oversized book:

#1: German Empire 1 mark 1908D, silver (.900 fine), CV $1 in VF.
#2: Italy 1 lire 1922, nickel, CV $3 in VF.
#3: Mexico 10 centavos 1938, cupronickel, CV $2 in VF; this is the "key date" of this short series.
#4: India 2 annas 1945 no mintmark, nickel-brass, CV 75¢ in VF.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis