Esp8266 Serial Connection using Arduino showing garbage

I am new to Arduino pro mini (5 V running it at 3.3 V) and esp8266.

I am trying to use AT commands using sketch program.

Here is reported the code I tried:

#include <SoftwareSerial.h>
SoftwareSerial esp8266(2,3);

void setup()
{
  Serial.begin(9600);
  esp8266.begin(9600); // your esp's baud rate might be different
}

void loop()
{
 esp8266.println("AT");
 if(esp8266.available()) // check if the esp is sending a message 
 {
 while(esp8266.available())
  {
    Serial.println(esp8266.available());
    // The esp has data so display its output to the serial window 
    char c = esp8266.read(); // read the next character.
    delay(10);
    Serial.write(c);
  }  
 }
}

It is returning garbage value as well as when i checked the value of esp8266.available() it is always giving me 63 WHY?

The blue light glows when the instruction is sent to the esp, I am also not getting the OK output as I was getting with the Serial Monitor.

I have been on this for two days and still getting the same issue, any help it's appreciated.

ESP8266 connections
vcc ~ 3.5v (battery positive)
ch_pd ~ 3.5v (battery positive)
rx 3rd GPIO
tx 2ND GPIO
GND (battery negative)