Ok so Im bit of a photo-og and I can help but you need to understand the basics of a SLR how ISO, aperture, shutter and light all relate to a picture. Focus is another issue all together as it relates to depth of field, aperture and your lenses F-stop.
Here are some of my pictures with "white" things in them to show you that different shades of white can be attained in there natural shade while getting the colour and focus correct on thing in the frame... some examples :
Wedding 1-2 by
Jay Gill Photography, on Flickr
FINAL 2_WEB by
Jay Gill Photography, on Flickr
This one is a good example of proper white balance with proper exposure for daylight while focussing on a specific thing and having the rest go out of focus.
5_MG_7474_E2_WEB by
Jay Gill Photography, on Flickr
Basically what you need to is understand that white balance is something that you can properly attain with a grey card which 99% of people don't have or by shooting RAW and adjusting in post or really-really knowing your stuff when you shoot.
There is a balance in everything.
This article explains white balance in detail :
http://www.cambridgeincolour.com/tutorials/white-balance.htm
For the purpose of what you are shooting which is essentially "product photography" what I recommend you do is set your camera's white balance to AUTO. Even with the experience I have I still use AUTO white balance a lot. Your camera is very good despite what people will say at metering the colour temperature in the environment.
Now if you don't know how to shoot in M mode and are only comfortable shooting in Av which is Aperture priority then here is what I will recommend.
If you are trying to just focus on his face and trying to make the rest gradually out of focus you need to get your camera to a F-stop that is small in number. So if your lens will go to F/2.8 or F/4 go to that and set your ISO to say 800. Again Im just playing a guessing game without actually being there and knowing your lens and lighting. Look at what your camera is setting your shutter speed at this point. Try and have a shutter speed above 1/100 at all time if possible. 1/80 is doable and 1/60 is pushing it without flash.
Unfortunately I am not the best teacher in the world or best at explaining things but I do know what Im talking about when it comes to this stuff.
Some basics that I can tell you without getting into technicall stuff is the following:
>>>>lower the F stop # more light comes into your camera and less things are in focus.
Here is what lower f stop # images look like:
You will notice the backgrounds are completely blown out and a specific thing is in focus in the frame...
E-Shoot3-4 by
Jay Gill Photography, on Flickr
Flower Bokeh ! by
Jay Gill Photography, on Flickr
E-Shoot3-1 by
Jay Gill Photography, on Flickr
>>>>higher the F stop # less light comes in and more things are in focus.
here are some example of higher f stop # images:
you will notice everything in the frame is in focus...
Mustang GT Power! by
Jay Gill Photography, on Flickr
FINAL_WEB by
Jay Gill Photography, on Flickr
>>>Shutter speed controls the amount of light coming in and its duration. lower the shutter speed (1/100) more light coming in and higher the shutter speed (1/500) less light coming in. Lower the shutter speed more chance of blur in the shot caused by shaky hands.
here is an example of a slow shutter speed shot (lots of motion blur and a lot of light coming in):
FINAL KS_WEB by
Jay Gill Photography, on Flickr
here is an example of a fast shutter speed shot (its so fast it "freezes" the action )
2006 Mustang GT 350 tribute by
Jay Gill Photography, on Flickr
>>>>lower the ISO cleaner the image but less light comes in. higher the ISO more light comes in but more noise in the image. basically look at ISO like there little light hunting bees in your frame. lower your ISO less of them there are and less light they can gather for you and less noise. More of them there are more light they can find for you but they will cause more noise
>>>>Stick to AUTO white balance.
>>>>Set your cameras metering mode to evaluative and leave it there.
>>>>If you can learn to shoot RAW and convert to JPG in post it will change everything for you.
Photography is all about light on the technical side of things and white balance is essentially the temperature control of the scene as it relates to 18% grey. This is a very simplified run down without making it technical although I'm sure your still confused after reading this, lol.
This is my best advice to a novice I can give. I just can't explain things well or Im sure I would be of more help.