the difference I've seen in a big plane is MOMENTUM! a big plane carries its momentum, whereas a smaller one really doesn't have any. this is USUALLY helpful, it softens up the controls a little and makes everything look smoother. so even if you aren't as experienced, you will look moreso with the big plane...

anyway, the gyro goes in a helicopter, usually mounted in the front under the canopy but on the mainshaft is the best location.

is this your first plane? that ISN'T a good choice as a first plane, there are lots of other big planes you may want first. keep in mind most people's first plane has a fairly short lifespan, even with an instructor, so don't get too attached to it. lots of people have left the hobby after crashing their dream plane early on, never to return...