Bike setup with aerobars?

I’ve bought some aerobars to use on my road bike, and I was wondering how I should alter my bit setup when I use them, if at all? Should I change the angle of the seat, or move it further forward on the rails? Should I take out spacers under the stem? to allow

from the little i know just try to get your elbows to sit at a 90dg angle… and maybe have a slight tilt up on the bars, shifters high, (like 4-5dg angle) so more weight is on your elbows not your wrists.

BUT i could be totally wrong!

start here: http://www.slowtwitch.com/mainheadings/techctr/bikefit.html
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Awesome, thanks for that!