Hi Bella! Welcome to Aeclectic. You joined on my birthday
Echoing what others have said about buying your own cards - I certainly did (nearly a decade ago) and so have most people here. No bad luck so far!
As for what to do with them - the most important is to get to know them. Go through them, look at them, one by one. Maybe jot down your first impressions, group the cards that have a similar look (not only in the same suits), pick out details that strike you, decide those that draw you, those that repel you, that kind of thing. Don't rush - enjoy. Tarot is an intimate occupation and it takes time and effort until your deck becomes a part of you. At its best, getting to know a deck of cards is like getting to know a new friend. You treat it well, with respect and learn to see it truly, it will reward you more and more.
Enjoy! And don't listen to those who put fear in you. Tarot is a gift you have given to your highest Self