When searching for data on which lens to choose you might consider using this site, Bob Atkins. Here
you'll have the opportunity to spend countless hours or days at reading through all his reviews. You can
choose from 3 options to begin with; show all lenses, show all prime lenses and show all zoom lenses.
narrowing it down, if you know what you want, say a wide angle single focal length vs a wide angle
zoom, will clearly save time in reviewing. Certainly we all want more lenses, especially when starting out
assuming you are using a SLR body.
Bob also offers many other criteria for learning about lenses; Just
choose Reviews> Lens> Cameras> then the lens you want to research
Bob has also has a Forum where you can register and discuss details of his reviews and other users opinions from personal experience. It's a great site for learning if you are in the market for a lens.