ask any questions you may have... I'll try to answer. I love my Cameo
The 10 feet part is more for vinyl. You can cut vinyl without a mat.
Go get your Silhouette Studio software, and there should be about 50 free studio files available to you for cutting. The each week on Tuesday, go back to the Silhouette Online Store and download your free file! Sometimes it's a good file, sometime not... but anything free is good.
You can also place files you may want to buy into a wishlist.
And each week they have a bunch of files on "clearance" for just $0.50. So your $30 should last a while, if you are picky on what you want to buy.
As for upgrading, don't pay the $50. You will be able to find "deals" for $25-$30 for the software upgrade to the Silhouette Studio Designer Edition.
I can even point you in the direction of few forums/facebook pages that are geared toward the Sil.
Congratulations!