can we

You can use regular cards. It's called cartomancy. here is a little guide to it. http://www.newagestore.com/cartomancy/Have fun and let me know how well it works for you:)

There are many pretty decks on sale at many places. But the best is if you make your own - because by doing that, you imbue your own individuality and energy into it - making it more powerful and accurate. But go ahead and get a factory made deck to start your tarot reading. Get the hang of it first. :P