JJ, you're in the right forum. This site has a wealth of institutional knowledge of most things regarding radio control, but you need to be in this forum with your questions for the time being.
The Goldberg Eagle is one of those timeless classics. The design has trained thousands upon thousands of r/c pilots.
Of all the trainers I've dealt with (including the original kit-built Eagle), I think the Sig LT-40 ARF is the best "newbie package" going; but only because it is slightly larger, with more wing area, than the others. I rate the Eagle 2 just behind it; and recently acquired one to replace an aging LT-40 that I tore up playing around with in high winds. I have a four year old grandson who will be ready to begin learning before long. I was toying with the idea of trying that new H9 P-51 "trainer"; but this NIB Eagle 2 ARF came along at a price I couldn't pass up. I may yet grab one of those P-51s, just for grins, but I know that, in the Eagle, I have a solid airframe that will do just what I need it to do.
Sorry for the above, which probably doesn't interest you in the least. I posted because my kit is missing the hardware too. The landing gear is there, but the bags with the tank, hardware, etc., are nowhere to be seen. I knew that when I bought the kit from the guy (he had no clue the stuff was missing- he bought it from a hobby shop), and its no problem for me because, like every serious r/c'er, I have several "junk" boxes and containers that hold enough left-overs to outfit several 40-size airplanes.
In fact, much of the hardware that usually comes with these Chinese-built ARFs is marginal at best, and is discarded by many modelers in favor of quality stuff like DuBro, Sullivan, etc. That is another reason I rate the Sig LT-40 #1; it comes with good quality accessories that don't need replacing.
I'm NOT saying that the stuff Goldberg/Lanier puts in the Eagle 2 is junk; I haven't seen it. And, to be frank, the cheaper Asian stuff is usually adequate for a model of this size that won't be flown aggressively. So don't let my wandering thoughts disturb you; use the supplied stuff with confidence.
One thing you'll find out quickly is that modelers are very opinionated, and there is almost always more than one way of doing something.
Welcome to the hobby, and to RCU...