Just gonna leave this here as well: A Beginner's guide to the ESP8266.Pieter
An FTDI chip is used in a USB interface which you do not need in your setup.
thanks for your response,but for testing with pc i have to use ftdi only? Logic level converter wont help?
An "FTDI adapter" (well, any USB-serial adapter) is for interfacing a USB Host (like a computer) to a serial device (like an ESP8266). Be sure to use one set for 3.3v if working with an ESP8266. A level shifter is for interfacing between two serial devices (or interfacing via I2C/SPI/etc) which operate at different voltages (such as a 5v Arduino Uno and a 3.3v ESP8266).