Building A Simple Scripter?

Hi,
I'm planning on creating a simple scripting engine. What are some things that I need to know before I begin. I would gladly appreciate it if you can point me to a web site or offer some assistance or just some basic ideas or steps that I need to follow.

Bye :)

Read a line from a file.
parse the line up into tokens
process tokens
repeat :)

Any More Suggestions?

?????????????????????????

If you don't know where to start, why not use some other scripting engine, vbscript springs to mind

i agree with paul