Access to ARAS's source Code

I think  your questions are implementation questions - and not related to Aras. You need to create an interface to allow users to input they search criteria. After that you need to query the db based on user input (my previous answer)and then checkout the file. Then you need to save the data from Aras to document properties, so you will be able to upload the file back to the server. Creating integration between PLM (or other DB centric systems) with Office is not an easy task for beginner. You need to create interface and be able download and upload files. Check videos of this  Aras Office Integration  or this  Office Integration by Aras partner XPLM  or this Office Integration by MinveraPLM (Aras partner)