Installing MS Exchange 2003

i am installing ms exchange 2003 in my organization and the questions are as follows

1- after installing MS Server 2003, do i really have to run dcpromo and make it a child domain, or ms exchange dosnt necessarily not require to run dcpromo and make it child domain.

2- On which server i will run /forestprep and /domainprep command.

answer me as soon as possible.