new SCCM server setup

Should I create a single VM that runs both SCCM and SQL (maybe 4 CPU with 8 GB RAM) using Windows 2008 R2? OR Break SCCM and SQL apart as VM for SCCM and either use the physical SQL server or create a VM SQL just for SCCM ??

Also where do I want WSUS installed? On the SCCM box or a dedicated box?

Management just handed me the task of getting Configuration Manager up and running. Their initial goal is patch management and software delivery (to patch 3rd party apps). A previous tech had tried to get SCCM up and running but left the company after setup and he did not document anything. He has SCCM running on a single Virtual Server connected to a physical SQL server. My intention is to uninstall his site, format the box and start over. I have read much the last week and had a few questions to help me get started.

Current setup: about 1200 client spread over 45 branches on a fully meshed MPLS network. Each branch has a 1.5 Mbps uplink to the cloud. HQ has a 45 Mbps uplink to the cloud. Each branch has a single Windows 2003 R2 32-bit server acting as a DC and file/print server. Physical SQL server is 8 CPU / 16 GB running about 40 databases for various apps.

I can create as many Virtual Servers at HQ as required. I can install IIS on the branch DCs.

I am thinking of either one or two Virtual Servers at HQ and making the branch server Distribution Points. OK ??

Question:

Should I create a single VM that runs both SCCM and SQL (maybe 4 CPU with 8 GB RAM) using Windows 2008 R2? OR Break SCCM and SQL apart as VM for SCCM and either use the physical SQL server or create a VM SQL just for SCCM ??

Also where do I want WSUS installed? On the SCCM box or a dedicated box?

Thanks,