Creating a marketplace is expensive and time consuming, not recommended If this is your first foray into ecommerce especially if you don't have the budget to meet reality.
There is no native feature to have a Marketplace(aka Multiseller aka multivendor) you have to build an app or use one from the app store:
So Im the owner of a multi vendor marketplace website. you can check it out at www.mybageecha.com - we list products of almost 100+ vendors on it since the past 5 years or so.
On the way, we created an app - https://apps.shopify.com/SHIPTURTLE to manage the complexity. It is working beautifully for us, which is why we decided to list it on the Shopify app marketplace for other merchants.