Side by Side SQL Server 2008R2 Installation with SQL Server 2000 SP4 on Windows 2003 SP2.

Hi all
I am doing SQL Server 2008R2 Side by Side Installation with SQL Server 2000 SP4,
Some body help me with your suggestions..
Environment Availble:
1.New iSCSI Drives.
2.32 GB RAM on Each NODE
3.Windows 2003 SP2 Cluster
4.SQL Server 2000 Cluser
5.Active/passive Cluster
Groups AvailbleIn Present Cluster)
SQLCLUSTER --> Groups
Resources
Cluster Configuration
Node1
Node2
Under "Groups" again Two Icons 1.Cluster Group and 2.SQL
Cluster Group
---------------
Cluster Ip Adress
Cluster Name
MSDTC
MSDTC IP Adress
MSDTC NetworkName
Q:Quoram

SQL
----
Disk G:
Disk L
SQL IP IpAdress(SQLCLUSTER)
SQL Network Name(SQLCLUSTER)
SQL Server Name
SQL Server Agent
SQL Server Fulltext

Task I have to perform: Adding new SQL Server 2008R2 Instance to excisting Cluster
Here I have Questions:
1.Upgrading Shared Componets.
A.Starting with Present Passive Node after Installation rebooting the Node.
B.Doing the fail-Over
C.Installing the Present Possive Node
D.Doing the Fail-Over

2.Starting the SQL Server 2008R2 Installation with Active Node.
A. Did Installation effect the Present MSDTC(Which is in Glustor group)?
B. Or Installation going to be Create one more MSDTC ?

3.If I start Instllation from Passive Node What is going to happend?
Please suggest me approch...

I will Continue questions ....
Thanks in Advance

Can you please answer the following first...
1. Are you adding sql 2008 r2 existing cluster? if so what is OS edition?
2. Are you doing this on production server? if not it is OK to test it

As I mentined I doing Side by Side
ANS 1. Yes adding SQL Server 2008R2 Instance and OS is Windows 2003 SP2
ANS 2. Yes I doing in Production Server
Let me know you what more information....

Nice details have been provided for SQL Server 2000 for SP4.
Regards,
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