You'll find the installation process for a pendant light easier if you take the time to find the right fixture first. Whether you live in an apartment or a house, most pendant light fixtures have the same basic wiring setup and are easy to install.
You might also want to take into account your room's natural light. For example, if you have a large window, hanging a smaller shade closer to the wall won't interfere with the available daylight.
Alternatively, if you live somewhere where there is less natural sunlight for instance in an apartment building, then choosing something larger may work better for you. So what is your favourite style? What colour should it be? The choices are endless, but the decision will come down to personal preference.