I Love Tarot!
TAROT BASICS - Getting Started
There are a number of Waite deck and book sets. If you are choosing one of these, see if you can find out a bit about the accompanying book. Waite himself wrote 'The Pictorial Key to the Tarot', which appears in some sets, but this is probably not a good starting book. It is well worth finding if you develop a keen interest in matters tarotic, but there are far more accessible works.
In addition to the Waite sets, I would recommend the Beginner's Guide to Tarot.
This Beginner's Guide was created by Juliet Sharman-Burke and illustrated by Giovanni Caselli. The deck itself is now available separately, as the Sharman-Caselli Tarot. I think this is because it proved very popular as a set, with many none-beginners buying this beginner's pack because of the cards. That is exactly what I did, so I was very pleased to find the book is also well worth owning. It has a lot of clear, concise and specific information, and is mostly Waite-based.
Instead of a set, you can of course buy a deck and a separate book / books. You will find many general tarot books and also books written specifically to accompany a particular deck. (See REFERENCE - BOOKS for a few starting suggestions.)