Camera Settings - Sunny Day - Nikon D3000?

I'm taking fashion photos outside, and need professional looking photos. I will be taking them at about 4:00 PM in a beach area, and also partially in a shaded area. I'm using 18-55 lens.
Please tell me what is the best setting on my Nikon D3000, to get the best looking photos. I'm not unable to hire a professional now, but feel I have a good camera that should yield great magazine-look photos.
Please advise on ISO, WB, and all other manual settings.

Your manual should tell you all of this, but I'll give you a start;

Daylight white balance, ISO reciprocal at f16 - 'The Sunny 16 rule.'

If you don't know how to adjust that for other speed/aperture settings, you've no business owning a DSLR.

There are no 'settings' which magically produce the best image - use the light meter & expose accordingly.

Keep the ISO as low as possible.

If you want a shallow depth of field then shoot with the aperture wide open at 55mm

WB is probably best left on Auto.

Shoot in the shade, but NOT in dappled light. Use a LITTLE fill flash or a reflector to bounce some light into the eyes & fill in the shadows.

The camera will only yield 'magazine quality' photos if you actually know something about the basics of photography & how to work your camera. That's why 'pro' images look 'pro' - they know what they are doing.