How to export full size image from Lightroom?

I m working with a print company to blow up 3 images to 10ft l x 8ft w. My print company told me this for "full size" images.

"IF you are looking to do a banner that is 120” x 96”
Make your photo 120” x 96” @ 75 dpi

9000x7200 @ 75 dpi in theory"

My trouble now is exporting from Lightroom and keeping the image full size. I shoot w/ a Nikon d5500 in RAW and edit slightly, so after I click export, what settings should I export at so it s big enough for the print company to make the banner? I m thinking TIFF… And should I save it on desktop, send it in an e-mail or put on the SD card?

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Best scope for shooting up to 600 yards?

Just bought a new 25-06 and looking for a scope to put on it. I would like to shoot 0-600 yards as I plan on coyote hunting and the shots are often long. I have looked at a vortex diamondback and a Nikon back master. I am not sure if they are quite enough scope for 600 yards… Any thoughts or suggestions? My price range probably tops at $250

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How powerful is an on-camera (built-in) flash?

A Nikon D3200 in this case, but I expect most DSLRs are about the same. And please could I have a comparison to the light of a candle or car headlights or something.

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Fast F mount prime lenses?

I own a Nikon D7100, although I will upgrade to a D750 in half a decade or so.

I am looking for super fast lenses (aperture faster than f1). I have heard of the legendary Noktor F0.95 which only cost $750 for preorder. Sadly, I can't find it anywhere (and apparently it has gone up!).

Thus, I am looking for ANY F mount lens, manual OR autofocus (although I'm leaning towards manual focus due to cost) that is faster than f1. F0.95s are probably what I'm looking for. Focal length should be around the 50mm mark (as most fast primes are).

Thanks

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