Hey Lim!
Read up on this document as a reference https://us.sagepub.com/sites/default/files/upm-assets/53627_book_item_53627.pdf/.
If a product category is established and you have research already completed about that niche then the marketing process will be more succinct and you can dive deeper into optimized targeting.
However if the product category is new you may need to learn a lot more about your potential customers so you will need to perform a lot more market research.