Hi Hussain,
Refer the below link for packages:
http://wiki.sdn.sap.com/wiki/display/EP/Downloading+and+deploy+ESS+and+MSS
Although the link is bit old but you can find the path on smp where you can find latest packages.
On portal, delpoy the required BPs through JSPM.
Thereafter you have to create following system aliases on EP 7.3
SAP_ECC, SAP_ECC_Common, SAP_ECC_Financials, SAP_ECC_HumanResources, SAP_EREC_TalentManagement, SAP_ITS_XSS, SAP_R3, SAP_SEM, SAP_WebDynpro_XSS, SAP_cProjects
Then assign required roles both in portal and at backend to the users.
Hope it helps.
Regards,
Prem