Sounds like you have an NT background. Apache and Webmin start based on shell scripts that are typically located in the /etc/rc.d directory. Try finding webmin by typing
find / -name "webmin" -print | grep "etc"
Then, cd to that directory and type ./webmin start
Next, use your webbrowser to connect to webmin, usually something like:
At this point, you can use webmin to configure Apache and many other useful features of Unix.