The one long and three short beeps is the ESC telling you that it's powered up and has found a 3-cell battery.

It is dangerous to deal with electrics, especially when you're not sure that all the functions are working in their required directions, especially the throttle.

After you hear the beeps and they are what you expected to hear, the ailerons, elevator, rudder, and throttle should function. They may be reversed, but they should answer the sticks.

What happens lots of times with a brand new build, is that the radio TX is not set correctly for ppm or pcm to match the RX. And nothing works except the beeper.