Graph ql to pull data from azure sql db

I am new to graph ql. There is a requirement to develop graph ql api to fetch data from azure sql db,the whole db tables data.
I dont know where to start from. What are the technology/apps can be used to achieve this? If anyone can list the architectural flow/ steps to achieve this? There is something called api management service in azure.can we create api using that from scratch?what is that used for?

Please guide me.