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Well the prefered C rating will vary depending on the capacity, 20C for a 5000mAh battery would be great. You could likely use the 5200, but if you are flying it hard or heavy your battery will not last as long.

You will likely not use the full power of your motors for very long, but you might be better with a 5Ah 20C

Are there any swiches on the radio?

Yes, make sure you are getting the 3S1P version (which is the one you linked), as the 3S2P is a little shorter, but twice as thick. http://quadcopterforum.com/threads/battery-c-rate-and-what-it-means.4695/

A little cheap, but no real complaints. Might suggest a 3S Multistar 5200mAh battery though. Also don't forget a charger :)

http://hubpages.com/entertainment/The-Advantages-and-Disadvantages-of-UHF-Radios

Range is easy, 1kg is not hard, and GPS is easy. I'd suggest APM, or NAZA if you are a bit tighter on money, there are some much nicer GPS enabled FCBs, but it sounds like either of those would be sufficient for you. The hard part is getting enough battery life to carry 1kg of weight...

In that case you could pull power from your BEC.

Just as Jakson said, it depends what you get, I have some color changing ones I wired to DIP switch and the PDB. I suggest you get the indoor/outdoor, AKA waterproof ones because they have a rubbery protection for the LEDs and SMD components and are a lot easier to work with. When...

Parallel.

802.15.1 (bluetooth) has a very limited range, if you are giving it instructions that it will complete then come back in range, or using a hobby radio you should be fine. There are a few options, you could have an arduino give it commands through the Rx's channels (this would work with any...

I'd suggest you not pull power off the motors like that because it could cause a number of problems, the resistance does not really have to be too close (likely cannot be as those may be non-standard values). If you pull the power right from where the power comes in from the battery you should...

Take a look at these two links. http://ledcalc.com/ and http://electronics.stackexchange.com/questions/27561/why-we-use-330-ohm-resistor-to-connect-a-led

I don't know of any for arduinos and quadcopters, but there is no difference in using an arduino to control a quad and an arduino used to control a land rover, if you can read a schematic (or in these days that is not really required), and can upload the code to the arduino (not too hard as long...

It is likely that you need a resistor, and you may need to wire them to an output pin on the IC if it does some computer controlled switching.

I'm sure there are many such tutorials for Arduinos.

Take a look at these. Not necessarily suggesting them just yet, but you may like what you see.

Two options would be, low KV/big prop combo or going with an x8 setup.

Generally hobby grade will be modular, and have brushless motors.

Sure, as long as it provides enough for the motors to avoid burning the wires you're fine. In this case I'm almost sure you are fine.