Quit worrying about this crap and start making stuff. I know that sounds like a harsh non-answer, but it's true. I offer it because sometimes I have the same problem. Quit sharpening pencils and start writing.

Do as much as you can with whatever computer you have and a copy of gedit or something similar. If you hit the limits of this within the first few months, it's probably your limit, not the tools. If not, then by that time you will be able to determine for yourself what tools you need.