Suggestion - instead of looking for some certification course (assuming you mean certification of your QMS personnel), get your company to purchase "ISO 9001:2015 Explained" by Cianfrani & West. Good advice on implementation and auditing. I've found that book super useful for developing and improving a QMS. And if you're really zealous, pick up Hoyle's "ISO 9000 Quality Systems Handbook", a thorough and exhaustive treatment of every requirement in ISO 9001:2015 as well as elaboration on ISO 9000 and ISO 9004.