if the sponsoring person passed the papers to the office is it the time the start of the processing?or is it possible that the our papers will be stuck or ignored?. what are we going to do after our sponsor passed the papers?
Once the local office approves (your spouse's) sponsorship eligibility, they will transfer it to the visa office of your country. From there the process of (your) PR will start.
You will only know that the papers are already sent to CPC-M through your post office tracker. CPC-M will not inform you that they got your application. You will only get a mail or email from them, that is within 30 - 45 days, that your sponsor (spouse) has been approved.