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G. Harry Stine, a pioneer of model rocketry, wrote "The Handbook of Model Rocketry" many years ago but it is still relevant. I added links for two book options. These sites are U.S. links. Not sure if they will work for you. https://www.amazon.com/Handbook-Model-Rocketry-7th-Official/dp/0471472425/ref=mp_s_a_1_1?adgrpid=1334807687301940&dib=eyJ2IjoiMSJ9.GkK94XZAqbmwCrzrK4zEavd2BwvzuJXtKxFtjtrB8RQrefRVwcE7XF3_43lqUwd5ta7sacfH7Mp17WIFvagl_YmZsuJjZSLfVxA4H4YRmzL_Q_b8bvw1sB_c9jiOiGt43N-VVfsPVRAkvzTa_q6b8xV8Wm9ZPojtXqXQ6rsrwLs78T6q5Mb00ZpoEJoonNOyLkw6763ZF2UeL_ubIg9Agw.asj7Cf3Jf0r9O4KUvrUhz0mNb7qa6siU-HfgcydjEOo&dib_tag=se&hvadid=83425719868547&hvbmt=bp&hvdev=m&hvlocphy=77876&hvnetw=o&hvqmt=p&hvtargid=kwd-83425839711531%3Aloc-190&hydadcr=22627_13496669&keywords=handbook+of+model+rocketry&mcid=cfe1c75ff954390fa8cb38579b2a4ccb&msclkid=882c25d65ffe1c5e3fad4c684bd4b592&qid=1774064688&sr=8-1 https://www.amazon.com/Model-Rocketry-Handbook-21st-Century/dp/1854862294/ref=mp_s_a_1_3?adgrpid=1334807687301940&dib=eyJ2IjoiMSJ9.GkK94XZAqbmwCrzrK4zEavd2BwvzuJXtKxFtjtrB8RQrefRVwcE7XF3_43lqUwd5ta7sacfH7Mp17WIFvagl_YmZsuJjZSLfVxA4H4YRmzL_Q_b8bvw1sB_c9jiOiGt43N-VVfsPVRAkvzTa_q6b8xV8Wm9ZPojtXqXQ6rsrwLs78T6q5Mb00ZpoEJoonNOyLkw6763ZF2UeL_ubIg9Agw.asj7Cf3Jf0r9O4KUvrUhz0mNb7qa6siU-HfgcydjEOo&dib_tag=se&hvadid=83425719868547&hvbmt=bp&hvdev=m&hvlocphy=77876&hvnetw=o&hvqmt=p&hvtargid=kwd-83425839711531%3Aloc-190&hydadcr=22627_13496669&keywords=handbook+of+model+rocketry&mcid=cfe1c75ff954390fa8cb38579b2a4ccb&msclkid=882c25d65ffe1c5e3fad4c684bd4b592&qid=1774064811&sr=8-3
You really should get the Handbook of Model Rocketry. You need to know more than the questions you're asking, especially if you're asking it like that.
If you really want to learn the principles behind model rockets and why things are done the way they are, forget YouTube and most of the internet. Go to the source that has been accumulating knowledge for 50+ years. Handbook of Model Rocketry 7th Edition What is in that book is what rocketeers have been using for decades.
First, learn the basic principles behind model rocket design. Handbook of Model Rocketry, 7th Edition is considered the handbook of the National Association of Rocketry. I would highly recommend studying it and learning the principles behind rocketry before you go off on your own. Don't reinvent the wheel, stand on the shoulders of giants!
Have you gotten a copy of Handbook of Model Rocketry 7th Edition and learned about Center of Pressure and it's relationship to Center of Gravity? The motor worked OK, but the flight was pretty unstable. Read the book and don't re-invent the wheel.
A great place to start would be Handbook of Model Rocketry 7th Edition, available on Amazon.
The Handbook of Model Rocketry, our Bible. Supposedly, an eighth edition is coming out soon…
This happens when your fins are too small. There's a great book about model rocketry that covers how to fix this problem along with many other things. If you want to fix the problem "correctly," pages 42-46 of this NASA document will walk you through the Barrowman equations, which will allow you to calculate how stable your rocket is by hand. However, math is hard, so I would recommend using OpenRocket, which is a simulation program that will give you the same results without having to go through a ton of tedious calculations.
As others have said, Estes is the place to start. They're fairly inexpensive and you can get full kits with engines and launch pads that are ready to go right out of the box. This book is also literally the book on the subject, and while I do have capital O Opinions as an experimental high-power guy about the National Association of Rocketry (whose official handbook it is), it is a very, very good introduction to all of the most important parts of the subject.