I'm trying to connect a WiFi module, ESP8266-01 to an Arduino Uno. But, as I've understood, this module will only work with 3.3 V. Since all of the data pins use 5 V, one of the solutions is to use a voltage regulator, such as LM2596.

My questions are:

• Does anyone know if there already exists a tutorial that describes the way this WiFi module can be connected to an Arduino Uno?
• For a simple server, would I need to use several voltage regulators (since there are quite many pins)?
• Since Rx is the receiver, it would not need a voltage regulator because that pin can handle up to 5 volts?
• Is there any need for an external power source, such as a cell?