I am not getting how to design my own plane if anyone knows it then
Pls respond with details

First  get familiar with a 3d CAD tool. Fusion 360 from Autodesk is a great one. It has got free trial and free for hobbyist.

Then follow his foot steps...
https://www.flitetest.com/articles/80-twin-commander-scratch-build

How to use autocad

Not autocad but Fusion360. You will get plenty of video tutorials in youtube.

Read this
https://www.bookdepository.com/Model-Aircraft-Aerodynamics-Martin-Simons/9781854862709

Its available on Flipkart , and i Just Bought it, Thanks Iyer sir for your recommendation.

https://www.flipkart.com/model-aircraft-aerodynamics/p/itmdym3exdkyyzg3?pid=9781854862709&lid=LSTBOK9781854862709UDMLIH

Quote from: K K Iyer on March 15, 2020, 12:18:11 AM
Read this
https://www.bookdepository.com/Model-Aircraft-Aerodynamics-Martin-Simons/9781854862709

Thank you sir. It really is a helpful book

Sent from my ASUS_X01BDA using Tapatalk

Flipkart cancelled my order, and after ordering again this time via Amazon, I got my hands on this precious book. Its really a fantastic book today, excellent coloured drawings and photographs. Loving it from day 1 . A million Thanks Iyer Sir, for recommending this book. I wish I had it 30years ago.