Hi Verrazano,
As in other plants QM is already implemented and now it is going to be implemented at your plant, Its a roll out project. All necessary basic config will be copied at your plant also provided, business process is almost same.
I would suggest you to list down all Business processes, and prepare separate sheets for its Cut-over data and Master Data.
Cut over:
1. Check physically,how many stock is under Quality inspection? Do you want Inspection lot for these stocks and so are you going to change stock type to QI once QM is implemented? (MM-QM)
http://scn.sap.com/message/6162301#6162301
2. How much Quantity for FG stock is picked in Outbound delivery but PGI is not done, and does QA require its clearance for FG material. Check report VL06O. (SD-QM)
Master Data:
1. MICs, inspection methods, Inspection plans will be prepared for new plant separately, Routings/Master recipes will be there in PP, Defects, Catalogs, Selected sets will be copied with config but make sure if you do not need to add specific to your plant.
Important thing is having BDCs/LSMWs ready for uploading, prepare all master data in respective Master data Templates.
2. Inspection types: Make sure you activate or complete all pre-requisite things to get inspection lot generated. e.g. for Inspection type 10 inspection you must assign Inspection Lot Origin to Delivery Type.
3. If recurring inspection is required, Prepare list of all existing batches with their SLED and Next inspection date. Change next inspection date in Batch master once QM is live. Before this you are supposed to Maintain Inspection interval in Material master.
These are the points I could re-collect. There might be other things I am missing here, Process understanding will be crucial before setting approach for any such project.
Amol.