FIM 2010 R2 SP1 Deployment Prerequisites

Hi all,

we are about to deploy FIM 2010 R2 SP1 to achieve the below requirements

1- Account management: unlock, enable/disable, delete
2- Group membership: add/remove user to group, 
3- Schedule for add/remove user to/from groups.
4- Schedule for enable/disable user.
5- Link AD account with Oracle system accounts.
7- Reset/unlock the password either by secret Questions/Answers or alternate Email address.

now what is the prerequisites (Hardware and Software)

- if i have SharePoint deployed can i use it or it's better to install the SharePoint Foundation.

- can we install on preexisting SQL or new SQL server, if we will use a preexisting SQL will we need a new instance or only DB.

- how many servers are required, what is the best practices.

Thanks