Welcome to WikiTree. I joined just about 6 months ago and it was a little overwhelming. Take your time, it'll get better.
Write your own profile. Just add some bio that you want people to know about you. Then, if you know your parents, add them. First try to search for them (under Find at the top). If there are no matches, then create them. Write profiles for them.
Then slowly add people from your GEDcom. Eventually you'll connect up with the larger tree. Ask questions all the time. Lots of people will help you.