How much is a flash trigger and how is it hooked up? Also, at what
angle can you use an off camera wireless flash from the
camera\distance from camera?
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The cheapest I think it's optical slave unit, around US $10.
Just attach it like on top your camera. It has a hotshoe.
Just make sure your flash reach the sensor unit.
You could bounce etc.
You need atleast 2 flashes for this set up.
One is on top your camera, and the second is attached on the slave unit.
If you choose this set up, then you could use NISSIN Di622 on top your camera,
while another flash (sunpak, or else) on the slave unit.
Cheap radio triggers cost more than optical slave unit.
Around $40.
If you use a radio trigger, you could use only one flash, which on the receiver.
But some of them are unreliable and have different working distance.