Control pixhawk without remote control

I build new drone F450 with pixhawk controller.
Because of budget problems … I ran out of money and i could not buy a remote control.
I have a lot of experience with software develop so i decide to try to write a software that i will be able to control my drone F450 from my laptop.
After building all the drone - i connected the battery and try to connect the drone thru telemetry ( one side on the drone and other side on the laptop )
The connection work and i can see the drone parameters thru ‘mission planner’.
But i can’t take off.
I can’t make the drone fly …
I mean that i try to make the engine spin without propeller … but this is not happening.
What i did wrong ?
Is it possible to make the engine spin on this situation ?
What to do next ?