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It all depends on the type of business and line of product.......................... Even similar products have different marketing plans & strategies..............
But all plans comprises of basic marketing principles i.e.,4 P's of marketing
The question is to general.
I should say it depend on the type of product and the market you are targeting and what kind of feedback you want to know as result of the product launched.
The simplest and straight forward approach is to participate in the Trade Fair or Exhibition related to your product and industry. Be sure to check who are the other participants, the fair audience and projected turn up and the potential for business matching. Also to check for any incentive by the local authority in conjunction with the trade fair/exhibition.