Hi Jessica, Welcome to Spark! Go to the "Getting Started" menu on the Start page. It is on the right side, in orange. There is also a "Site Guide" menu. You can start either place.
The site looks overwhelming at first because there is so much solid information. It takes awhile to find your way around, but it is seldom boring, even after you use it for a long time. Be as patient as you can, because it is worth it!
Congrats for taking the first step and finding the message boards!!
Feel free to message me if you have any other questions. Most of us like to help.