I have gone through many decks looking for the one that is just right for me, and I suppose I have an odd experience: my most accurate and easy to use (for me) decks are decks where I don't particularly like the artwork. I can't deny that they work well, but I'm still searching for that absolutely perfect deck, lol. Just pick up one you are drawn to and start with that. There's nothing wrong with giving a deck away or buying another. When you find your perfect match I suppose you'll settle on that. I have had at least 8 decks that I can remember off the top of my head and I really only use 2 now.
You can buy companion books to the deck you choose. Decks come with a little pamphlet telling you basic stuff about the cards and it usually gives you a spread or two. The companion books are like separate books you buy that are supposed to be more in depth, but I've never bought one and my reading has improved just fine.
You can meditate with the deck, or make your own rituals for when you read. Some people say to look through them all thoroughly before use to get to know the pictures and the feel of each card. Also, really really look at each card and see what it means for you, along with the book definition. Look for symbolism (or lack of) in the art.
If you have any specific questions please ask!