This tutorial guides users through setting up a conference call using Java, Spark framework, and the Vonage API. To start, they need to create a new Java project, add necessary dependencies, define an answer route for incoming calls, configure their Vonage account, and expose their application to the internet. The process involves purchasing a virtual phone number from Vonage, creating an NCCO with talk and conversation actions, and configuring Spark to serve the NCCO. Users can test their application by calling the purchased phone number and having multiple people join the conference call.