how can i start designing games ? from where should i start ?

Answer 1

You can start by learning a language (I think learning basics is enough to make simple games). For example if you finish c# course and watch some Unity 2d game making tutorials you can create simple games.

Answer 2

For Android: Java
For Unity: C++ or C#

Answer 3

Start with something very simple. I would recommend using a game engine instead of coding the Framework of your game by yourself.
Maybe try Unity... it is free and there is a huge community to learn from...take a look at some tutorials on youtube and even on their own website

Answer 4

I recommand you to try Unity