Right settings for nikon d300 dlsr?

I have a nikon d3000 and I tried all the settings, and the one that I don't like is the no flash settings.
Everytime I take a picture, it's like.kind of yellow or orangeish something like that. I just want it to look like I had the flash on, but I really don't. Any advice?

You most likely have your White Balance set to Auto.

Try setting it to incandescent when taking photos that come out orange.

The reason the flash works is that it's color balance approximates daylight, but then when you go inside into a room light with incandescent lights, the color of those lights gives you an orange tint to them.

In short, the flash and lights produce different color light, so you have to set your camera up to work with that light.

Remember though to reset your White Balance back to Auto or other appropriate setting when you are finished taking the photos, as your daylight photos will then be off. Set the White Balance to whatever lighting is in each scene.

http://www.althephoto.com

There's no one right setting; if there were there would not be so many different settings available. It sounds as if you are taking photos under tungsten lighting inside without changing you white balance or having it on auto white balance. I suggest that you sit down with the manual and go over each setting and try to understand the power of the camera in your hand. Bets of luck!

By not using flash you are capturing the natural colour which your brain"converts" to the "normal" colour; the best way to explain this is the white-car test.

Look for a white car when out at night and look closely at the colour. You SHOULD notice that it will have the colour cast of the ambient street lighting but your brain will tell you that it is white and you will accept this. Sadly film and digital media don't have any connection with your brain therefore records what it sees with the colour cast as determined by the settings of your "White Balance".

The solution is to adjust this colour balance - another reason for using RAW where the "White Balance" edit can be edited to adjust the natural colour to the image. As noted in an earlier response images taken under tungsten light should be adjusted to tungsten in oder to return the colour to natural / normal daylight tones.

If you have only JPEG images then you need to adjust the colour balances by trial and error in the "Adjust" options using "Colour Balance" and "Contrast" to find the colour mixes which give the most natural daytime tones.