BOT Creation

Pick any .net language and go from there. Learn WPF and the .net framework, Learn different paradigms , OOP/FP/POP etc, and study up on html,http,tcp/ip, etc.

The core fundamentals for programming web bots does not change from language to language. Here is a good book to get you started as well, Good Luck.

http://www.heatonresearch.com/book/http-programming-csharp.html

you should decide what kind of bot do you want?
You bot can be based on webbrowser or on raw GET/POST requests.