Ηello, can i douvle Tap with VTG and if my turret misses, i do a 3rd attack with missiles or primary again?

You cannot make more than one bonus attack in a turn, so neither.

No you can't.

Double edge ability allows you to perform a bonus attack.

The VTG double tap is also a bonus attack.

And as per RR page 6, ships are limited to one bonus attack per round.