How do I make Turn-based RPG?

I want to make an Turn-based RPG but don’t know where to start and what do I need to code and learn about it. The turn-based system I design it one or more character in the field the maximum is 5 character that I can bring in the battle, the left side is the player, the right side is the enemy. When click on a character is will show command and fight with the selected enemy and the character have differences range attack. Right now I just want to make it to be able to attack enemy and taking damage from both sides. Can someone give me some guidance.
Thanks in advance.

You’re definitely going to have to learn how to code before you can make something like this.
However, here’s some stuff to get you started:

https://github.com/mindcandy/lu-battle-rpg