Need help for quadcopter flight controller project

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Joined May 29, 2017
I'm working on a micro quadcopter project which uses coreless motors for flying. I am designing the flight controller myself. Its brain will be an STM32F103C8T6 microcontroller. Now I have some questions:

1. The battery is a 1S 3.7v Li-po. At full charge it has a voltage of 4.2v, which needs to be regulated down to the 2.0-3.6 volt range of the microcontroller. Can I use a Zener diode for this purpose?

2. I want to use an HC-05 for bluetooth communication. It has a working voltage of 3.3 v but it is integrated with a voltage regulator which take inputs between 3.6-6 volts. How should I solve this problem?

3. What sort of MOSFET shall I use? The motors are brushed.