You need to have (1) a very solid SQL Server DBA and (2) a Windows Server administrator with domain administrator rights to get the BI stack set up correctly. As most Windows systems people will tell you, a lot of good comes out of doing some security planning on the domain side (users, groups, roles, etc.) before you start the implementation. This is a big integrated system, and getting it set up right is half the battle.
On the development side, you will want to have a full time data architect making sure that the model you are developing holds together and supports the reporting requirements of the business. You will also want a technical lead who has rich experience with the stack - that person will be able to shepherd the rest of the development team and help them come up to speed with the tools.