Welcome, Linda! I'm so happy to see you're volunteering to get started, and I'm delighted to confirm you as the newest member here at WikiTree!
You can get a feeling for what you can do at WikiTree with this 'getting started' page:
Help: How to Use WikiTree
When I got started, I just added a few immediate members of my family tree, and then after a while gained confidence to do some research and add many more. And now I find WikiTree is so much fun I enjoy working on "our family tree jigsaw puzzle" most any chance I get!