Assuming you want it to be black background, white text
:hi normal ctermfg=white ctermbg=black
If you put this in a file called .vimrc in the root of your home directory it'll automatically set it every time. In fact, I'll post my whole .vimrc so you can see all the options I use:
" some colors: "white on black"
hi normal ctermfg=white ctermbg=black guifg=white guibg=black
hi nontext ctermfg=blue ctermbg=black guifg=blue guibg=black
" Syntax Hilighting
" enables real tabs for Makefiles only
au BufReadPre Makefile set noexpandtab
" vim -b : edit binary using xxd-format!
au BufReadPre *.bin let &bin=1
au BufReadPost *.bin if &bin | %!xxd
au BufReadPost *.bin set ft=xxd | endif
au BufWritePre *.bin if &bin | %!xxd -r
au BufWritePre *.bin endif
au BufWritePost *.bin if &bin | %!xxd
au BufWritePost *.bin set nomod | endif
That is all pretty straight forward, I turn on cindent (uses spaces instead of tabs), set my widths to 3, show the ruler at the bottom of the screen (cursor coord.), and use syntax highlighting.
I also have special rules for Makefiles and Binaries so they show up how I like.