Marketing plan and strategy. Sales Plan and strategy

I have a business plan that I need to update it Marketing plan and strategy. Sales Plan and strategy. The business plan is about a marketplace app that is developed for Shopify. Then, it will expand into other platforms such woocommerce, bigcommerce and squarepace. I need to update the marketing and sales based on the VC feedback. Also, it need to consider all other business plan sections and financial model. In addition, plans should be update on liveplan.com. Furthermore, I will outsource marketing to an agent at the beginning so the freelancer should has knowledge about agents like klientboost.com and ninjapromo.io. Also, the freelancer should be able to recommend the best agents to me.