Hi, I have been thrown into CL - Development this February.
The easiest thing to do, as
@JochenL said, is to pick up a programming language that is easy to start with. His idea to use Javascript, HTML and CSS is pretty straightforward. Just look into how they work a little bit. Nowadays it is very easy to start with those languages as you have loads of ressources online in text or video format.
The same thing about the editor, in my eyes, Visual Studio Code is like Atom on steroids, a lot faster and for me it just feels great.
The next step would be to look at the API documentation for the Campaign Logger and just trying to get a feel for it, then continue on and on...
If you want to, you can look at these
examples . There I created two really really basic examples.
If you are just starting out, if you look at the jQuery example you can at least see, how to use the api a little bit. Just know, that what I did there are in no means best practices or anything in that regard. But at least they show you how you can set up a real small project that uses the CL Api.