How i can do simple transaction with node API

I’m confused with assets.

I have set assetId: ‘WAVES’ but I don’t have created any waves asset in my account.

assetId: ‘WAVES’,
feeAssetId: null,
feeAsset: null,

‘Waves’ is a built-in asset, the basic one. You can use ‘WAVES’ or ‘null’ if you want to transfer waves. For other assets you have to use a Base58 encoded ID of an asset.