Which kind of strategy should be set by Marketing Manager for Marketing Plan to introduce or launch the new product in the market?

It really depends on the product,the market,and the company's preferred execution plan.

I would personaly adopt a proactive approach.

Maket penetration strategies and market penetration pricing.

1. identify potential market through proper research.

2.competetive price.

3. good promotions.

I think this totally depends on the product and considering the audience. A pharma product must be launch to gain profile but considering the competiters and audience we customize our launch. FMCG sectors have fast pace marketing with focus on masses. it totally depends on the product and the customers.

Strategy for the market plan to launch a new product will completely depend on the product and the target audience.

First question is whether its a B2B or B2C product?

If its B2C, who is your target audience and what is it that you wish to communicate about the product to your target group?

What is the kind of budget you are looking at to get this communciation across?

If you have enough money, you could do some market research to understand your target audience better. This will help you in formulating a better strategy. 

So before starting with the marketing plan, answer all these basic questions first as it will help you formulate the strategy and the marketing plan with ease. 

Depending on the type of product you wish to introduce, you can begin by advertising it through various medias (such as newspaper, internet, brochures, flyers etc.....).

Depending on the response, you can design marketing activities according to the requirement and budget.