Special ligatures in InDesign CS2?

Hey, I know Adobe fonts such as Caslon, Garamond, Minion, etc have many extra ligatures that Adobe doesn't automatically put in (such as st, ſt, etc). However, I don't know how to type them. I went through all the option + and options + shift + options to find characters I want to use (such as long s, the ct ligature, special letters). FontExplorer allows me to see the glyphs and gives me the Unicode for it, but is there any way to to type them into InDesign?

go to the type menu and open glyphs, double click on the one you want to insert it into your text wherever your cursor is