Practicing fashion photography with a amateur model. Have a t2i with just a 50mm 1.4, Should I shoot in Aperture Priority mode and let the camera auto set everything else? If not what should my iso/wb/fstop etc etc settings be? Shots will be inside and out. Thanks! Oh and shutter speed setting too(feel free to add more things too!)

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Try lowest ISO, Auto White Balance, Aperture Priority at f/5.6 or f/4, AF on, single focus point at center.

This can't be answered as it will depend on the lighting. You may want to go to the library and see if they have any books on the subject.

Shoot in manual mode, learn to control exposure yourself, and ditch any "auto" modes. Your setting should be what are appropriate to the light and situation. Use the lowest ISO you can for best image quality. It sounds like you could use some basic courses in understanding exposure before you get too far into this -- there are a number of on-line tutorials that will give you a good start. Peace.

The best mode is Manual. There is no way for us to tell you what iso, white balance, shutter speed, or aperture you need to use without seeing the exact lighting you will be shooting in. That is what your camera's light meter us for. I suggest you take a beginner's photography class since you are clearly clueless.

I'd start with Manual mode, 1/125 shutter speed, f/8 aperture, ISO 100, and adjust from there. Getting readings from a light meter is a much better option. Indoors, use Flash white balance. For outdoors, Sun, Shade, or Overcast/Cloudy white balance depending on weather and location. Now this is assuming you have a decent lighting rig for indoor shooting; and flags, scrims, and reflectors for outdoors; and that you know how to use them. If not, you have a *lot* of research and practice to do, and perhaps some additional equipment to buy! Getting high-quality lighting is probably more important than actually taking the shot. It is your job to control where light falls on your subject. The camera can only control how much of this light makes it onto the sensor. Location, makeup, model skill, and shooter skill are the other key ingredients.