Teresa...there are indeed online charts, but since most of the symbols would not be pronounced by your reader, I don't know how they would help. In the All Chars program I noted, it is 'almost' intuitive what combination of keys to use. For example, French accents are done by just hitting the ctrl (control) key, and then the e and ' characters. (What does your reader do with colons, semi-colons, quotation marks...etc?)

Do you hear accented words? Is schon different than schön?