Hi, welcome! 
I think you should use truffle develop to open a Truffle console.
And maybe you can have a look at this tutorial: Create an NFT and deploy to a public testnet, using Truffle | OpenZeppelin Community
Hi, welcome! 
I think you should use truffle develop to open a Truffle console.
And maybe you can have a look at this tutorial: Create an NFT and deploy to a public testnet, using Truffle | OpenZeppelin Community