How much experience do I need to make a bot and program in unity?

So what the title says. I've been learning C# with the book head first C# and when i'm better at it I want to learn how to make a bot.
Even if an extremely simple one that does an extremely simple task that does two clicks.
Also, around when will I be able to make a very basic game with unity 3D? That's the primary reason I'm learning C#. When will I be able to code some stuff to use in unity 3D?

And one more thing, if I wanted to make a small game in unity 3D is it bad that I don't like modelling like at all?
Do I HAVE to model? Is there alot of people who also don't like modelling but still do stuff with unity 3D?

Thanks in advance! I'll be sure to give a thanks if your post was helpful.

EDIT: What's actually better to start with; 2D or 3D games? I saw a 2D concept with drawings and stuff, it looked pretty good.
Do you guys think if I don't really feel for 3D modelling, 2D modelling will be any different?
Is it way easier?

There is more than learning the language syntax and features. Now you need to learn about Windows(R), and how to get the info you need / manipulate things. For example, you could make a pixel bot, or a ReadProcessMemory bot or even injected. To click on a specific text is hard because that generally required "word / letter recognition which isn't 100% straight forward..it's complicated depending on font etc. There is more than 1 way to do most tasks: you have to choose which is the best for your project.

If you knew which tutorials to read, maybe 2-3 months before you understand windows well enough / what you actually want to do (as far as read from a process, a file, what is a process, codecaves, etc etc). All depends how much/what you read. Also depends what you mean by "bot" ... auto-clickers can be considered bots, which is relatively simple: All depends. Big projects may use several methods (pixel + mem read + read log files, etc)
-As for Unity, idk, sorry.