To make money with NFT, you need to have some skills in the arts.

1) First of all, you spend time and paint a unique picture. It should be beautiful, colorful and attractive to others. Then you scan your canvas and create a JPG file.

2) You then register on the NFT platform of your choice. For example, take a look at the Rarible project:
https://rarible.com/

3) After that, you upload the image file to the website. The platform automatically generates an ERC-721 token to organize an auction. People can connect the Metamask wallet to the service and buy your collectible with $RARI tokens or ETH coins.

Profit!