set up robots.txt

hi whats up every body can some one please help me need help on setting up a robots.txt basicly what i am trying to is only allow the index page and disolow all other pages from being crawled by the SE can you please explain to me how i set this up and were it should be uploaded thanks

thanks man just checked it out i really appriciate it bro

yea im cool for now im probly gonna set up a robts txt in the morning if i run into any problems will let you know