How to make home-taken photos look studio like?

I'm taking photos of a model against a white wall in my house with a Nikon D90 50mm lens. I don't have any other professional equipment apart from that.

Lighting will be natural and indoor light.

my question: what are the best camera SETTINGS to use, which will achieve the most professional effect?
also. How do I eliminate as many shadows as possible, so the photo looks more high-key style?

To eliminate shadows shine lights were they are apearing and they will eventualy all disapear set your tones on your cammera to a semi sharp setting and to get that really great studio effect having large white cloth reflectors on the side make the picture look better

Firstly find the spot with the best natural light. Decide if you need a reflector board on one side (large piece of white cardboard or a sheet even). Decide if you want the background blurry or sharp. Do some test shots. Using aperture mode, for blurry background put aperture on largest setting (smallest fstop number) or if wanting sharp focus throughout, put fstop on smaller setting like f8 or f11. Move the bounce board around to get best light.

I use a 50mm 1.8 nikor lens for portaits.

Aperture, f2.8, ISO 200, Shutter speed is whatver your camera tells you, as it will depend on the intensity of the light. Could be 1/30 of a second, could be 1/500 of a sec.

Place your subject several feet from the background, and that will help eliminate the shadows on the background.

You may want to get a professional lens as soon as possible, like an 85 1.8. Turn off the other lights in the room in the beginning, Add them only if and when you can deal with the different color temperatures.

What you are using will produce what you are looking for.

Set your aperture to the smallest number (highest aperture)
Have your subject at least 3 feet from the wall.
If you have lights you can shine on the wall behind your subject do so. (it will cancel out shadowing)
DO NOT USE THE CAMERA FLASH (if you must ok but it is not desirable)
Natural light is different a different times of the day so set your white balance before you start shooting your subject. Set your WB to PRE and aim at the white wall press the shutter release and look for GOOD if it says NO GOOD do it again until you get GOOD.
ISO should be 200 or 400
Place the subject, test shoot and find the focal length of the camera lens distance from the subject that gives the sharpest picture. Note this distance and try to keep at it. Watch for you casting a shadow on anything.