Capturing Quota Arrangement modifications

I have a requirement to send an email whenever a Quota Arrangement is maintained (through MEQ1). I am fairly new to ABAP and SAP and I'm trying to determine how to go about doing this. So far this is what I think I have to do:

1) Create a business object for a quota arrangement (would the key be like the EQUK or the EQUP table?)

2) Implement the edit method. (Would I implement it with the transaction MEQ1 or the function ME_UPDATE_QUOTA or would I have to create a BAPI for this method?)

3) Create a workflow triggered by a save in MEQ1 (I'm not sure how the trigger works in workflow).

Anyway, I have very few specific questions (see above) but I just want to see if I'm heading in the right direction. If this isn't the right way to go perhaps you can point me in the right direction.