Sounds to me like you have one heck of a good brother. That sounds like a nice setup. You are on the right track as it will be a while before you are ready to fly that plane. Let it serve as something to work towards, a Goal to be achieved so to speak.

I just started in this Hobby last fall, and soloed my trainer earlier this spring. I am now in the process of building my third plane while I am flying my trainer, and my Cherokee. I am telling you this because there is no way I would be where I am right now without the help of the folks in my Club. The best thing you can do is find a club nearby that can help you get started. They can help you find a trainer to learn on if the club does not have one that you could use. They will be able to teach you all about the hobby, and keep you heading in the right direction. It looks like there are a couple of clubs in Sioux Falls and one in Brookings.

Link to the club finder.
http://www.modelaircraft.org/clubsearch.aspx

Also read the threads at the top of the beginner section labeled as stickys. There is tons of good info there.