Welcome. So glad you're looking to contribute to this fun site.
You've already been given some great advice. The only thing I'll add is that if you use the "report an inaccuracy" link that is found on all set and card pages, more people than just Admin can see that and can help (usually faster). If you send a message just to Admin, it may take a while, as they are bombarded with messages and other things (keeping the site running smoothly, fighting SPAM attacks, making improvements, and handling the items in the inaccuracy reports that only can be handled by Admin).
Updating Teams is one of the first things a member here can do, but there are some specific guidelines that Admin wants us to follow. Please be sure to take the little quizzes to gain access seriously, and you'll be up and running here in no time. Thanks for helping out!
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).