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open aperture widest possible
Only if Ce_Jeu wants a shallow DOF.
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set iso to 800
This will likely introduce unwanted noise to the image.
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half press the shutter
In low light, autofocus may not be able to pick out a point of high contrast.
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The camera will calculate a shutter speed that it thinks will give a good exposure
Unless it reaches the >30s range, in which case Ce_Jeu will need to switch to manual and set the shutter himself.
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adding light with a flash
The best decision - although an external flash will produce far better results than the built-in one. Get a diffuser for the flashgun and a cable connection for it - you'll need to bounce the light off a wall onto your subject in order to avoid harsh shadows. Ceilings and walls are good for this. Failing that (you may be in open space) get yourself a reflector and fire it onto that.