From your post, it seems like you are browsing the packages in the Synaptic Package Manager... right? It will be a pain to go through each one since there are literally thousands of packages and many are simply smaller programs (libraries) that are used by the 'main application'... which is actually what you will be using.
The easiest way to find an application to accomplish a task is to use the search function at the top of the package manager. Search using semantic terms e.g. 'image editor', 'photo manager, 'video editor', etc. That way you will not have to decipher weird program names. Then look for the packages with the Ubuntu logo in the 2nd column. This logo indicates that the package is officially supported and means that they will generally be more mature and stable applications. Going through these supported applications will be much quicker and I'm sure you will find what you are looking for much faster.
That said, the Fluxbox CE comes preinstalled with applications for most common tasks. These are sorted by category in the submenus when you right-click on the desktop. First see if what you want to accomplish can be done with the existing applications. If not, you can go ahead and install what you need.
Seeing that you are doing something work oriented, you may find Open Office a more suitable set of applications than the default AbiWord and Gnumeric (which are also capable but less featured).
As Kendall said, if you can tell us specifically what it is that you are trying to do, then we can give you more exact advice and point you in the right direction. No use handing you a spoon when you need a knife