You are correct in thinking that Linux distributions will help not get a virus, which is because most viruses are coded for Windows (not Linux), It is still possible to get infected (although it greatly reduces the chance. I haven't looked at the tools released by wikileaks, but there is probably stuff that targets Windows, MACS, Linux, ext....
So my point is be safe rather than sorry.
Yes. All steps to help is good. Also VPN for going online.