to get started be sure to take a quick look at the docs. We have a lot of documentation that will allow you to get started.
I see you are looking to create an element, you can find the steps for that on this page.
If you want to create some dashboards based on the data you collected from your devices you will find information about that on this page.
Do note that there are plenty of courses available on the community website to get you started with DataMiner. I would advice you to take a look at the DataMiner Foundational training and the Visualization training for Dashboards.
Let me know if I can be of assistance to get you on your way.
Further to the comment of Baptiste, I have now made the Lawo V_matrix connector available for you as trial. you should now be able to download it via catalog. If you have any other connectors you like to test, you can request this via an email to the DataMiner Licensing Group <firstname.lastname@example.org>