steps for registration and work

Hi guys. Anybody would give advices. Because our situation is my husband has appointment next week in Gemeente for registering himself in Antwerp . Just today he have a job back again, he took 2 weeks off because of finding and moving to Belgium. My questions how this work-out of taxes and how long does it take to get his card? Then can i start applying for visa c?

Your big help much appreciated.

thanks much.

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