It's easy enough to enable your (Windows) computer to type Chinese characters.
Once enabled, you can type numbered pinyin and have it automatically converted to hanzi.
Components of Chinese Characters
Traditional vs Simplified Characters
The Evolution of Characters
Chinese Math Game
Two things that you may want to do on your computer are:
1) type in numbered pinyin and convert it to accented pinyin
2) type in numbered pinyin and convert it to hanzi (Chinese characters).
To convert from numbered pinyin to accented pinyin, try a website conveter such as:http://www.pinyin.info/unicode/marks3.html
or try Zhengsheng Zhang's Word Macro method as listed on Tim Xie's website:
To learn how to enable your Windows machine to type Chinese characters (by converting from numbered pinyin) watch this "Typing Characters" animation.