Something to keep in mind is they do fly different depending on size, power, props, battery.
You might want to find something cheap that is close to the same size and power to the end product you want to master.
The smaller and closer together the props are will make it more sensitive to pith and roll. More power will make it more sensitive to throttle inputs and less will require more aggressive commands.
If you want a camera ship, headless and gps, then you only need a basic understanding of control and some practice.