Problems using gazebo ignition with ROS2

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I have just started programming ROS2 and I have to start a project with ignition gazebo by creating a real environment in simulation. I have to do it in fortress and I am having so much problems. The first one is that there is no so much tutorials or info in creating this type of worlds in Ignition. The second one is that in this new version I have found some interesting examples but there are so hard to understand. The last one is that I do not know also how to do the basic aproach to the problem. I need some first guides and I need someone with experience that could help me in this first phases of the process.