Those are tough questions, because many different answers are correct. Most of the 40-sized trainers fly about the same, and wouldn't be a problem for you. I'd go with whatever you think looks best, and also whether you want to build or buy something pre-built. As to radios, you can't go wrong with Futaba, however there are cheaper brands that work perfectly well, and each brand has its adherents. Minimum field equipment would include someting you can use to fuel your plane (e.g. pump) and something you can use to start it (glo-plug igniter). Starter motor, batteries, tools, spare props, and other spare parts are up to you. It's good advice to visit your local flying field and have a look around.