Not to worry Donna, I'd guess that the vast majority of the people who have their DNA tested at Ancestry don't know how to make the best use of the results. It's pretty easy to get started. First you have to login to your account at Ancestry. Then look at the top of the page on the left side you'll see "DNA", click on that and you should see a menu, select "Your DNA Results Summary", this brings you to your DNA home page. Near the center of the page you should see a box that's titled "DNA Matches" which will have a green rectangle near the bottom that says "View All DNA Matches", click that green rectangle and it will bring you to your DNA matches page. Here you can see all the people who have matches with your DNA and are related to you in some way. They are broken down by the size of the match which roughly corresponds to how closely they are related to you. Ancestry makes an educated guess at the relationship and puts more closely related people at the top. If you have any they will show first cousins at the very top then second cousins and soforth. Theoretically second cousins should share great grandparents with you, though they could share any of your four pairs of GGPs. If you click on the "View Match" button on the right it will give you more information about that match. By clicking on the "Pedigree and Surnames" button you can see if they have a tree at Ancestry and for some matches Ancestry will try to figure out your connection (this requires a paid subscription to Ancestry). By clicking on the "Shared Matches" button you can see who shares a match with both you and this particular person which can help you determine how they are related. Having first cousins who have tested helps here as they can tell you which pair of grandparents a shared match is related to. That should get you started.
Don't despair if the closest matches you have are third cousins as there's a pretty good chance that they may actually be second cousins once or twice removed in which case they will descend from your GGPs but will be your matches' 2nd or 3rd GGPs.
Get that part figured out and then you can start thinking about uploading your results to FTDNA, MyHeritage and GEDmatch all of which allow you to upload the results you got from Ancestry and fish in more ponds as they say. And, of course, you are very welcome.