I was in your same situation, back several years ago!
I also chose to start flying again with the FT Tiny Trainer.
I set mine up with the aileron wing, and absolutely loved it. I would suggest going this route, as it will give you the basic controls that most planes have. I see the 3 channel plane set up, and change of the controls that they have, as a difficult adjustment that would be needed to switch to a 4 channel plane. Start with a simple and easy to fly set up, with limited throws, and you should be good! I was able to get it adjusted and trimmed out with no problems. I then enjoyed flying it and increasing the throws, and eventually making it do maneuvers that a home built foam plane probably shouldn't be able to do! After 3-4 months of flying several times a week, it succumbed to an unfortunate high 'G' turn after a steep dive where the wings collapsed. I still rebuilt it, but have moved on to other planes. I will pull it out if I want to introduce someone that has not flown at all, or for someone that is still learning. The benefit that I saw with this setup is that I could fly it without a fear of really damaging it. I crashed it often, while I was learning, and trying different maneuvers, but was able to always get it back in the air with minor repairs utilizing tape, glue, or a replacement prop. I have friends that were hesitant, or extremely cautious to sometimes just fly, let alone try out some of the maneuvers that I was doing, just for the fear that they would damage their high dollar planes. With that alone, it is a great plane to learn on!
As far as glue guns, I started with a cheap one, and just learned how to make it work. It is easier with one of the higher temp guns, and I think the one that I am currently using is a Stanley that I got at Home Depot.
Good luck with your build, and enjoy!