Welcome to FRC, I guarantee that you will have a blast.
The transition from FTC (I noticed you were on a team) to FRC can be overwhelming, but i am sure you will be able to grasp it within time (I was in a similar situation).
What I did when I was a rookie was I experimented with different subteams of the entire FIRST team I was with. My team was split up into several subteams (mechanical, electrical, pneumatics, CAD, Animation, etc). Once I found where I wanted to go, then I started to ask questions and gather information about that specific part. Have a friend in that subteam that will teach you the basics of each subteam, and then you can move on to more difficult aspects.
Basically, get a feel for what you are interested in, and them start learning about that topic (via research, practice, or assistance of a veteran member).
Shoot me a PM if you have any questions. I'll be more than happy to answer them.
