What lens to use for wedding photography?

When shooting wedding photography what would be the best lens for a Nikon D3000? Best manual setting? And I have a external flash it's made by sunpak but i'm looking for something more professional?

Added (1). Please take note i'm looking for advice not negative feedback! I have done a few wedding so far but i'm looking to improve althought my work has been very satisfying for those i have provided my services for! I'm only looking into buying newer products!

Added (2). I'm not limited by anything i'm just setting goals, i have a website www.dyanacarrollphotography.webs.com, I use manual settings most of the time and i change things up constantly, I'm looking for more speed! I have shot a few weddings the images i provide to my clients they are very pleased with, but as I have learned everyone has their own style with photography, and how they take pictures with their choice of the use in camera brand, and editing. I use a Nikon D3000 with a 18-55mm VR Lens & a 55-200 VR Lens!

If you can't answer these very basic questions yourself, you have no business doing wedding photography.

We can't really answer this question effectively without knowing what lenses you already have, your budget, and what you feel you are limited by.

I typically use 4-8 lenses to shoot weddings.
And the manual setting depends on the location, the light, the time of day, the subject, etc.etc.etc.

If you didn't know that there's no one manual setting to use, I can't imagine how you've done any work "satisfying" for clients. Go educate yourself before doing any more, ok?

Does the truth hurt? As a newcomer to Y! A, perhaps you are not aware of the can of worms you are opening by asking such a very basic question when referring to wedding photography. Be prepared to hear some uncomfortable things here, which are never-the-less absolutely how it is.

Evidently you have been lucky so far. You may continue to be lucky as you eventually learn what you're doing on the job, or your luck may run out and you will face the wrath of an unhappy client. Asking what "manual setting" to use is sort of a giveaway that you are lacking in practical theory if not vision.

The first thing I would go after is a backup body. What would you do if your D3000 clonks on you? Then a fast short zoom and a fast tele or portrait lens. The usual lenses for a crop sensor are the Nikon 17-55 f/2.8. The 70-200 f/2.8. On a budget, the Tamron 17-50 f/2.8. Perhaps a 50mm f/1.4 or 1.8 for low light and portrait. I use a micro 105 sometimes. The flash would be an SB 800 or 900 or whatever is next to come out.

Buying a new product will not improve your skill by itself.

The 18-55mm will be enough unless you want to do a portrait of the newly weds from the bell tower. If you don't have one, get a strong external flash. It will come in handy when covering indoor events. It is better to use flash and get a correctly exposed shot than lose a moment to artistic stubbornness. The bride is always the focal point, as much as possible always keep her sharp.

Best manual setting? If you didn't know it yet, putting those three words together in a photography forum is akin to announcing to the whole world you don't know a thing about photography. Perhaps you have worded it wrongly. I'm giving you the benefit of the doubt.

Taking a short glimpse at your site, I noticed you're fond on tilting the horizon. It may be your style but be aware that a wedding is a formal event and being such it needs to be treated and presented that way. Bear that in mind even when shooting wedding candids.

24-70mm f/2.8

Quite frankly, you have no business shooting a wedding alone without at least one backup body, lens, and flash.

Edit: I stand corrected. After seeing your portfolio, it's painfully apparent that you have no business shooting weddings, period.