Here is a brief beginners guide for Guardian players in Rift. If you are absolutely new to the game, and are not sure at all of how to play, then watch the video below to learn how to pick up your first few quests, get souls etc.
Even if you want to play as Defiant this video is well worth watching, as it will give you a great insight into basic game mechanics. Rift can be confusing if you have never played online MMORPG games before, so this is well worth watching for all new players.
There is also a great wee preview of Rift Supremacy, which is perhaps my favorite strategy guide for Rift. If you are new to the game and want to learn how to play properly then I really do recommend that you buy yourself a copy of Rift Supremacy. It costs less than $35 USD, and is a great resource full of leveling guides, excellent builds for all callings, and item and quest guides; you also get free updates and a money-back guarantee.