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Hi ssatyaki,
1) First find hobby electronics shops near to your home
2) Buy Bread Board, Solder Rod, Multimeter, Variable power supply
3) Buy 555 Timer and 741 opamp
Now you are ready to get started...
Bread board simple circuits such as blinking LED with 555 timer, experiment with different values of capacitor and resistor. In first attempt it may not work. Dont loose the interest and curiosity. keep experimenting. Once made the LED blink, you will be happiest guy in the world.
After getting a grip you may experiment with LDR, Photo diode, Microphone, Thermistor,Reed switch, Loudspeaker, Piezo buzzer, Relays, etc
Build, experiment, observe, play.... you will get a confidence, you can help others.