using your PC as a server really isn't a good idea (as chris* mentioned) unless you already know you are going to make mega $$ from it for whatever various reason. This is because in order for it to be worth while, you would have to invest in @least a fractional T1 line, for which you would have to lease a CSU/DSU and DVM modem from telco - making really big monthly bills.
if you wanted to do it, you would have to be hosting quite a few websites for clients to make it worth the $$.