xeonous 0 Newbie Poster

im new to dns thing
i bought a domain name from smallbusiness.yahoo.com
i have a small home networking. one computer is a server which is connected to dsl. n my computer is connected to that computer through a switch
and i want to webhost from my computer
everything is set apache, mysql, php, phpmysql, etc
but i dont know where r the dns settings and how to set them. and what ip u ppl r talking about is that my ip? or my home servers ip? or something else?

and if i setup my dns etc isnt it the transfering of domain name?

please help
thnx