I have used Fedora 3, RH 9 and RH 7.1 and the command to list all processes was just "ps" (without the qoutes).
Now to stop or start a service... for me it has always been "service servicename restart". However, for Debian I do not know. Try using "path to service restart".
If you want to do it the easy way, you might just want to install webmin (www.webmin.com
Hope I helped...