Fluxbox window manager is not for beginners, you should start with gnome/kde or xfce.
But if you insist on using fluxbox, I can help you with this issues.
Learn some basics about rpm, packages and source tarballs.
To install rpm: rpm -ivh name-version.rpm
To uninstall rpm: rpm -e name (so it's the rpm package name, without version and extension)
To update rpm: rpm -Uvh name-version.rpm
.tar.gz and .tar.bz2 are compressed source files, you need to compile. stick with rpm
You can find rpms you need on
http://rpm.pbone.net
download latest fc2 fluxbox rpm and install.
Leave the /usr/local/bil/fluxbox file alone.
To change fluxbox right-click menu edit the /home/username/.fluxbox/menu file.
the .fluxbox folder is hidden in your home directory, try: ls -a
All the configuration files are there in that folder.
Fluxbox is just a window manager, it's not like GNOME/KDE desktop environment.
So when running fluxbox you can use apps from KDE/GNOME to do stuff....