Setting up your first collection on OpenSea is simple, let's walk through the steps below.
From opensea.io, select Create from the top, then My Collections.
Select Create to begin a new collection.
Once you have multiple collections, they will be viewable here as well.
Enter your collection’s name, description, and upload an image logo.
You are not making NFTs at this point and all these details can be updated later.
Now your collection is created and we can begin adding items, select Add Items to begin.
To update your banner image, select the pencil icon in the top right. Your banner will look different on different devices, so aim for banner image dimensions around 1400 x 400 and avoid text.
Next, make sure you have a website (personal website or Instagram) or a Twitter handle.