How to capture speed shot on my Nikon D90?

How can i shoot super quick 4.5 fps shots on my Nikon D90? (i have the AF-S Nikkor 18-105mm 1:3.5-5.6G VR Lens)

what ISO settings and etc? (i'm still a beginner)

When I do sports or water photography, I just use a really fast shutter speed (put my camera in shutter mode, then increase speed), provided there's enough light. If there isn't enough light, a fast shutter speed will just result in a very dark or completely black picture.

To shoot at 4.5fps, you need to put it into continuous mode (see your camera's manual).

What settings etc depend on how much light there's.

I would set your ISO to the highest setting ISO 3200. (See pg 74 in your manual.)
You can also set your camera to Mode S (shutter speed priority). (pg 41)
You need to set the camera's Release Mode to Continuous High Speed. (pg 64)

I would think that if you would have spent that much money on that camera, you would know how to use it. Just read your manual.

4.5 fps You should get the battery grip, It offers the camera to do a higher burst rate.

SPEED SHOT? What kinda shot? Speed cam be measured in many forms, and each with a different answer.

So you don't go out and spend money for no reason you should know that the battery grip will not increase your fps on the D90.It will on the D300 and some other higher end bodies but not the D90.

You want to set your shutter release mode to continuos high. Press and hold the button that looks like multiple stacked photos just behind the shutter release button. Rotate your command dial on the rear of the body with your thumb until you see the image of the stacked photos with an H next to them. Next go into the menus and go to menu selection d6, CL mode shooting speed and make sure you select the highest number of frames per second. You'll be good to go.

As far as what settings. It will different for every situation. There are no general settings for say, sports photography. The best thing to do is learn what the settings that affect exposure do and how to use them. It may be a little intimidating at first but it really isn't that hard. You have a great camera, don't let it take photos for you. Make photos for your self.

Take your shooting to the next level by learning to take control of the settings that control exposure. ISO, Aperture and Shutter Speed. Check out this crash course tutorial here:
<a href="http://www.ehow.com/how_5279081_sh… To Shoot In Manual With Your DSLR</a>

or copy and paste http://www.ehow.com/...-dslr.html

If that is to much to quick, pick up the book "Understanding Exposure" by Brian Peterson.

Hope that helps and happy shooting.