I need advice or suggestion on how to go with the Documentum integration with SDL Tridion 2013 sp1 any web link or document regarding the same .
The was previously a EMC Documentum Connector for SDL Tridion product that allowed two-way communication between the two repositories.
However, as noted on the release announcement of SDL Tridion 2013 SP1 (the version that you are using) on SDL Tridion World:
The SDL Tridion Connector 2011 for SharePoint and SDL Tridion Connector for ECM Documentum are replaced by the SDL Tridion Connector 1.0 for CMIS
CMIS (Content Management Interoperability Services) is a standard that allows Content Management Systems (such as SDL Tridion and Documentum) to connect, and reference/share repository items, over the internet.
More details on SDL Tridion Connector 1.0 for CMIS (including installing, configuring and implementing) can be found in the online SDL documentation.