You can get a Hitec or Futaba receiver. With the HiTec receiver, you can use HiTec, Jr, Futaba, or the blue-connector Airtronics. Probably others, too, like Cirrus, if you specify the connector. With a Futaba receiver, I know you can use Futaba servos, and GWS. I think that means you can also use JR, HT and blue AirTronics servos, but you must be careful of the orientation of the connector plug in the receiver.

You can get various flightpacks with receiver and 2 or 3 or 4 servos. Two that come to mind are hobbyhorse.com and ServoCity.com. ESC's and electric motors should be purchased (with batteries) from someone knowledgable, at the same time, so that your power system provides the power you need for whatever plane you get. The ESC plugs into the throttle channel in the receiver, just like a servo.

The answer to your question #5.... you need either an ESC or a throttle servo, to control your power. You need servos for each of the other functions you have (elevator, rudder, ailerons) but not necessarily two for ailerons. Many 4 channel planes are set up with one servo for ailerons. Also, some small planes have no rudder, just a fixed vertical stabilizer. Those usually have no landing gear, they just skid in on the belly. When you select a plane, you will see what servos you need... or you can ask about a specific plane before you buy it.

The receiver crystal is not a fuse, it does select the proper frequency. I don't know if they are all the same size. My crystals have the 72MHz "channel" number on them. They are numbered somewhere between 11 and 60, because those are the available "channels" for the places where I fly on 72 MHz. I don't know what "2 tx band" means, unless it refers to a different frequency. I suggest you contact a club or look at the AMA website for more complete information on available frequencies and their designated numbers. AMA is at www.modelaircraft.org.

There are "getting started" sections on lots of places, like RCU, AMA, and the websites of many RCU contributors. It sounds like you could devour a ton of that type information, so let me point you to a couple. Do a search here on RCU for Caffeenman and Geistware, both have sites with introductory material. Their websites are listed on many of their posts.

Best wishes,
Dave Olson