Radio controlled hobbies can be pretty costly. Toy grade models might be good for kids, but someone who is pursuing a radio controlled model hobby should invest in a hobby grade model.
The most common and preferred RC model is the car. But let this not limit your search and options. The concept and principle of the RC model is virtually the same, and all hobby grade models are simple and robust in design. Most require some practice to master the control. A car is a good place to start, and later you can invest in an airplane or other more advanced model. A person who has access to a free open ground (even a big football field is fine!) can safely invest in assembling a hobby grade RC airborne device since in the beginning stages, one requires lots of space to practice the control of the model.
There are dedicated hobby grade RC model makers who have hundreds of different models, and they will almost surely have one that suits your pocketbook and preference. It is a good idea to shop around at a few hobby grade RC model shops before investing in a model. This is because you might find a better model for your preferences, the cost might vary a little, and you will hopefully get to know more hobbyists that you can connect to by visiting these places.
The only limit to the amount that you can invest is solely based on your own capability. If you wish, you can invest in a low end model or you can go for the latest high end models with sophisticated circuits and controls. This is especially true with respect to the airborne models. But, wise investment is required and investment is NOT recommended if you are not a real radio controlled device enthusiast, since these hobby grade RC toys are costlier than the toy grade models available in retail shops. If you are questioning whether you can find time to play with the RC model, then the hobby grade toy is probably not for you.
In earlier times when internet was non-existent, face to face meeting was the only way the enthusiasts could contact each other. Even phone or snail mail was too clumsy to interact effectively. But the enthusiasts have always traveled long distances for the sake of their hobby just to meet one another. This is the indulgence in the hobby. But, the advent of internet has virtually reduced the world, your arms length away being just a-click-of-your-mouse-away. Real life meeting is not at all required, but still one can connect to another remote control hobby enthusiast from another end of the world. Real life groups are still the most effective means to get to pursue the hobby more effectively. Online groups can be of help to connect and to organize more extensive events, and to know about the various hobby related activities taking place.
Time is the most important factor when considering any hobby. A hobby is an activity that has grown more than just a wish to try activity, and you yearn to do it day in and day out. One might not always find the time, but the passion for the activity is what makes it worthwhile. If the thought of playing with remote controlled toys piques your interest, then it means you possibly have a flair for RC controlled models and you should give a try.