Cisco 1721.... How do I set this up?

Greetings,
New here. Please bear with me, I have been in computers as a career for 8 years, but I am new to cisco routers.
I am trying to configure this router. It is a 1721 with a wic t1-dsu card in it. What I would like to do is use the sdm to configure this thing, but I cannot get it to work. What do I need? I have it connected right now with the blue cable (serial on one end), and when I boot up the router and have hyper terminal up and connected, it goes through the boot process fine. I just have no understanding of the command line structure. Hence me trying to use the sdm.
Is there a default ip address that I can use with the sdm? How do you reset the router back to the defaults?
I have just taken over a network that the old network administrator walked out on. No documentation, nothing. So I am playing catch up. This router was sitting on the shelf, he said (before he left) that he was going to put this one on the network and replace the 1720 router that is in place now.
I am trying to learn this one so if the other one goes down, I have a spare to throw in place.
If anyone can help me out, I would greatly appreciate it.
Thanks in advance.

to get the router to its default (factory) configuration use the resetting router technique described in the following link:
http://www.cisco.com/en/US/products/hw/routers/ps221/products_installation_guide_chapter09186a008007e57a.html#wp1022265
more 1721 links:
Overview -
http://www.cisco.com/en/US/products/hw/routers/ps221/products_installation_guide_chapter09186a008007e5b3.html
Configuration Guides -
http://www.cisco.com/en/US/products/hw/routers/ps221/products_installation_and_configuration_guides_list.html
Troubleshooting -
http://www.cisco.com/en/US/products/hw/routers/ps221/products_installation_guide_chapter09186a008007e57a.html
(this technique will assist you in setting the router to a state where you can access the command line to update any IP or config)
if you need configuration help, please state what you want the router to do and the topology it is to be placed into and we can provide configuration examples you can use.

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