Mixes are prepared in terms of dialnorm, a measurement over time of an average section of human dialog. External meters (Dolby makes one for instance, these are not peak or RMS meters) are best but you can export bits of your mix and measure it properly with tools like Audio Leak for mac.
Full theatrical has a dial norm of -31db, this allows massive headroom for things like explosions or other dynamic sounds.
Broadcast will vary by station, but is usually -27db or -24db.
Most theatrical mixes are remixed to -27db for DVD/BluRay.
For Youtube, all is fair. I would try a dialnorm of -18. Why? most people are just blasting levels as high as possible, but -18 gives you some headroom for background tracks and still makes the dynamic range of the mix small enough to sound good through cheap computer speakers, laptop speakers, headphones, and phone speakers.
In terms of #2, if it's larger than DVD, then you need to follow some level of compliance. DCI has a few 2K based sizes
http://en.wikipedia.org/wiki/Digital_Cinema_Package
You may need to have a mastering house prepare a DCP file if theaters don't take DVD or Bluray.
In terms of your last question, it's content dependent. The presets will get you there but you can't crank up the quality too far beyond. DVD has an encoding bitrate limit around 8mbps - 10mbps so you can improve things by using two pass encoding on your master.
Angelo Lorenzo
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks
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