Forum Thread: How Do I Start a Career on Hacking?

To answer questions 1 and 2, (1)you should probably learn as many as possible, but i would say the two main ones are python and c, or a derivative of c, for example c#/++. (2) no, you don't need a laptop, you can setup virtual machines to try and exploit using virtual box.

M4R10 is right but you need to learn ruby, javascript, perl and so on.
6.You can create your own virtual lab to test and practice