How can you switch the j and k keys in vim?
You can do it, but this is a Bad Idea™! This is going to cause you grief down the road.
However, if you are dead set on doing this, put these two lines in ~/.vimrc:
:nnoremap j k
:nnoremap k j
As for left/right moving wrapping on lines:
:set whichwrap+=h,l
See :help 'whichwrap' (with the single-quotes), and note that the help says this is not recommended.
Bill Joy wrote Vi on the ADM-3A keyboard, seen below:
It didn't have its own dedicated arrow keys, but had arrows associated with the letters as seen on the keyboard. It's a Unix thing, too, or was.