Well do u mean u want to start ur own hosting company? if ur just starting out then u should get a reseller account to start off. that will save you a couple hundred dollars a month. (check out http://www.hostgator.com/resellers.shtml reselling starts at about $25 and it has a billing manger included so it's all automatic.), but if you want a server still check out a Dell PowerEdge 2950 Server
or if u just want to start a website i suggest Hostmonster