Unity Scripting an interactive game tutorial

Hello. I'm new to Unity and working on a game project with my group. My job is to script an interactive game tutorial. What is the first step in doing so? Right now I have a GUI.Button that jumps to a scene with the game itself. I want to use this to make an interactive tutorial where text bubbles or labels appear to instruct the player what to do, and allow them to do it until they are ready to proceed to the next lesson. I hope people understand my intention here. I tried looking around but the keyword involved show basic tutorials that don't help with what I'm trying to accomplish. A small first step or a push in a direction will help. Thanks.