Welcome to WikiTree Karen! We are happy to have you join and hope you enjoy WikiTree. There is a bit of a learning curve but if you take it slow and ask questions, you will learn quickly.
One piece of advice is to add your parents and grandparents and maybe your great grandparents manually so you will see how to create profiles and add sources. Then, upload a very small GedCom - maybe 20 people; get those through the GedCompare process and then upload another. It will go much quicker that way and will give you a chance to clean up the profiles from the GedCom upload.
I hope this helps and we look forward to your contributions!