Firstly what version of vCenter are you talking about,
Secondly you require administrative credental to install as you are creating services etc.
Thirdly have a read of the install documentation for your desired version.
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Tom Howarth VCP / vExpert
VMware Communities User Moderator
Contributing author for the upcoming book "[VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment|http://my.safaribooksonline.com/9780136083214]”. Currently available on roughcuts
you will need a database for Virtual center SQL server/Oracle. You can choose to work with MSDE (free) if you choose to.
Create a ODBC connection to the database.
Install VC application and it should be pretty straighforward.
After VC is installed add the ESX servers (using fully qulaified domain names) to VC.
Consult install guide if you still need help