Useit...
One option is right in front of you if you happen to notice: Seems every page on this site has a banner advertising training, course study, et al for the Part 107 certification. That's one clue.
Another is to do a search on this site for Part 107. You will likely find links to FAA sites where one can find study materials, practice tests, testing center locations and requirements. Also, consider registering your craft. The decision you will need to make is whether you intend to go commercial or remain solely hobby.
There is a ton of information out there; too much to list here considering it has already been listed. Google is also a great source. Not trying to slough off or anything like that. Rather, letting you know my personal experience: use the search tools at hand to lead the way.
Take your time, research, take advantage of all the free (as well as for a fee, your choice) materials. Practice, let it soak in, practice some more, and when you are ready, good luck!
Hope this helps!
Jeff