Once the database is created using DynamoDB console or the CreateTable API, with the help of PutItem or the BatchWriteItem API provided by AWS you can insert items in your table.
You can also use GetItem and BatchGetItem to retrieve the items from you table. If the composite primary key is enabled for your table then you can use the Query API to retrieve the data from your table. These are the different sets of query that you can run using DynamoDB API.