The use of the ESP8266 in the world of IoT

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By Arieel
#36859 first of all sorry for my English, I hope you can understand me.
Hello! I'm new in the world of ESP8266. I have to know how can I configure the module whit an Arduino, because I haven’t a usb to serial adaptor.
I found that I have to install a new board to the Arduino IDE (https://github.com/esp8266/Arduino/releases/tag/2.0.0), and this circuit

Image

Is it correct? Because I know that the board use 3.3v, and the rx-tx have 5 volts. I know that it’s best use an external power supply, but in the conections it’s the same, I change te 3.3v and graund for the power supply, and not from the Arduino.