Configuring a Cisco 3620

I have a Cisco 3620 with 3x WIC-1DSU-T1, 1x 2FE-2W, and 1x 1E-2W. I have 2 T1 lines being brought in by ACD.NET, a local CLEC. Within the next 3 months we will be getting another line from them, as our bandwidth needs grow. I am new to cisco and need help configuring this router. I am currently on a 1M DSL line with them. The DSL modem is connected to my Microsoft Windows 2003 Small Business Server which is hosting our email (Microsoft Exchange Server) and Website (which is currently down for upgrades). I am also running a Linux box with Asterisk@Home on it (an awsome VOIP PBX server). I would like to have the SBS server connected to the Ethernet port on the 1E-2W, the Asterisk and VOIP Network Connected to one ethernet port on the 2FE-2W, with firewall. The remaining port on the 2FE-2W I'd like, if possible, to connect the DSL line to, for backup. I would be willing to allow you to connect to my network via VPN and then connect to either a local computer to connect to the router, or to the router directly. I can also be reached at 800-757-5669 x4861.