There are a number of tools that can be very helpful when organizing research. Here are some we find to be especially useful:
1. Mendeley (Free)
2. RefWorks (Free via Penn Libraries)
3.. EndNote (Not Free)
There are many other tools that are useful --e.g., Evernote, OneNote, Zotero, Microsoft Excel, etc.
Check out the Penn Libraries guide to find a tool that is best for you and the way you work.
It is very possible that you will be expected to share documents you have located. Please be aware (read: ASK) your boss/professor how they would like materials to be shared with them. Do they have a Dropbox? Do they use Penn+Box? Do they want you to share a folder on Mendeley? Do they want you to email PDFs? Do they want you to print materials out?
You will likely want to create an effective foldering system for yourself. We recommend using something like Dropbox or Penn+Box, so that you can access materials from everywhere (and when your computer crashes it isn't the end of the world).
You may want to be aware of how you title files in your folders. One useful default for scholarly articles is Author-Keyword-Journal Citation(Year). For cases, Name-Citation(Year). It doesn't matter how you title them, unless your professor/boss prefers a particular order. Just be consistent. You will save a lot of time if you get in the habit of being consistent and organized.