Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
There are so many options that I am getting a bit confused.
I just want to work without publishing and a need of an internet connection, and when all is ready, just release it.
You can use the XAMP server, I am also using the same for the last 5 years. And also you can consider to use Microsoft Web Matrix as the editor because it provides wordpress syntax highlighting, suggestions etc.