You need to make a marketing plan.

You need to make a marketing plan: according to the available data (info about the product and the market), you need to make a promotion strategy, etc. (think about landing, presentations, write the TZ for them, make selling texts, etc.). Technical knowledge is not necessary (the main thing is to make a competent TZ and work with the performer).

Payment for work by agreement, the amount is discussed at the interview.