This free download lets you see and select more characters in the Unicode set. The Unicode Character Grid shows all 99,089 assigned characters and 137,468 private use characters in Unicode 5.0.
Here's a blog covering Scripts, Unicode, Character Encoding and BabelStone Stuff BableStone Blog
When you put letters together, they make words, words make sentences, and what do sentences make? Ultimately, sentences lead to education resources, such as books. To put those words together, you may need typing lessons. You can even learn HTML and put your words on the Internet.