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First of all php notices are nothing to be concerned about. When it says 'warning' or 'error' then you have a problem. Simply turn off phpdebug and the 'notices' will go away.
Unfortunately I'm not familiar with the DMS module...but since you wish to troubleshoot this module you could post specifically about it in the module troubleshooting forum. However there are a few things you can do first:
You have probably have all the offical documentation - what about checking out this
tutorial on module deployment and other tutorials at this site. This first one will take you through checking everything was done right.
The most important place to look for help on this site is the FAQ section - and there is a section for errors, and for modules in there - so take a little more time for some research there and you might find some answers.
Finally use the 'search' function - type in DMS Module and you might find this has been discovered and discussed before.
Good luck - sorry I couldn't be more specific!