It looks like you have a start on a beginning European collection. Since you have been collecting them for some time, what do you want to do with them?
There are no rules in stamp collecting!

You can organize and mount them in many ways. You can learn about the countries and where these stamps fit in. Many local libraries have worldwide stamp catalogs, so you can research them. Also, there is StampSmarter.org which has a wealth of stamp information. Check it out!
You can enjoy the stamps and add to them to extend your collection, or you can donate them to many organizations.
Cheers!