Hi Janis, welcome aboard. Hang in there for a while, the light bulb does eventually go on, but it might be in little increments here and there! As Ros noted, the tutorials are a good place to start. To address a couple of your specifics -- at the top of your profile page, there's a search box that already has the surname of your ID filled in. You can use that to search the data base for all profiles with that surname, or you can enter any other surname you'd like to search for. And under the 'Find' menu at the top right of this page, there's an item called 'Relationships' that lets you check whether you are related to any other ID in the data base. That's only as valid as the data that has been entered so far by others, so it's not foolproof, but the results are often interesting. If someone else thinks they are related to you, they would not necessarily need to notify you. But from time to time distant cousins do find us on WikiTree by searching the web for some ancestor, and they do contact us through the e-mail link on our own profile.
Finally, since this is a free site, there's not a big paid staff available to help you or contact you. There are volunteer mentors who provide some one-on-one help if you need it, but this (G2G Forum) is really the right place to ask your questions. Good luck!