"Glow powered" refers to the fact that engine starts by making the "plug" glow by applying voltage. This is as opposed to "spark"ignition like in your car or "Diesel" which uses no plug. Diesles run as a result of high compression.(simplified but essentially correct) "Glow" engines use a fuel consisting of Methanol and oil with USUALLY about 10-15% Nitro-Methane. More or less Nitro is fine but 10-15% is typical.

Best radio? If you choose an RTF (Ready To Fly) like suggested above the plane will come with a nice "Starter" radio pre-installed and ready to go after charging and safety checks.
If you choose an ARF (Almost Ready to Fly) or build a kit then you will need to provide a radio system. If you are going to be serious and continue in this hobby I'd recommend a 6 or 7 channel radio as you will quickly outgrow anything less if a typical pilot. One point is to find out what brand is used by the instructors at your new club (Yep, don't forget that) and see that you can "Buddy" up to their radios for training. Going the ARF way is a bit more expensive and you would also need to provide an engine which is included in an RTF. With your stated budjet I'd say a RTF is the way to go.