Doug,

On the bottom of the cowl when you open the window. Looking down inside there's a angle that's flat, my receiver is taped to that with double sided tape. As far as the battery goes, they are made for one physical size in particular. The receiver should have came with a paper to show what channel controls each function. Inside the plane you will see a very small piece of paper on each lead near the plug that tells what that wire controls.

My battery sets in an angled slot towards the front of the airplane. I was ignorant about what's on the market for RC airplanes having been out of the for 20 years. I bought this one to get me back into the air as my first. It was a little bit of a pain to get figured out for me at first, but after I got it going, it's a fun flyer. I put wheels on mine because I don't own a boat to go chasing it across water if it comes down.