Like here: http://wiki.roblox.com/index.php/Taking_keyboard_input it shows some keys values, how would I use print to find even more, such as the value of 'a' or '/'
Use the KeyDown event of a Mouse.
You can get the mouse of a player (on the client) by using the GetMouse method of a player.
The article you supplied (from the wiki) does show you how to compare what was pressed using an if statement, though.
u mean dis ? http://wiki.roblox.com/index.php/Taking_keyboard_input