So I'm inferring that you are a beginner in RC. That being the case, welcome to the hobby, and don't start out with a Cub. They are very satisfying planes once you have some piloting skills, but everything requires more skill with them. They will ground loop on takeoff if you don't know what you are doing and also can be lifted by a headwind before you are ready, they require decent rudder skills in turns, they get tossed around a whole lot by wind turbulence, they don't self-correct at all, and and they don't weathervane into the wind like most sport planes and trainers do. I've watched a couple of guys at the club working with good instructors be frustrated to no end because they just had to learn how to fly using a Cub. Get yourself a trainer and build your piloting skills with it, then when you're good and competent finish the Cub and enjoy it.

Also, there's no reason to buy less than a 6 channel radio. The Cub will require at least 5, and going with 6 gets you the computer features that are so very handy to have. You can do ok with a 4 channel radio with a trainer, but you'll just be buying something new when you move on to another plane because it won't have the ability to store multiple models.