help ,, pleaseeeee!!

i have installed a virtual linux on my windows box. and found the command there not very enough. for example , the "rpm" command only has these at all: -i: install package -q: query package -p: query uninstalled package -i: shou information -l: list comments -d: list documents -c: list config files.

i want to install Nessus on ,and i download the Nessus-3.0.2-es3.i386.rpm. i type : rpm -i Nessus-3.0.2-es3.i386.rpm and i think its has been installed . but where is it?and how can i start it?

thanx in advance.