Several of us are in the middle of doing work to create tutorials. What you asked is so simple and basic that I will take time right now to create a simple tutorial for how to use TAPE and VALENTINA to implement the instructions posted by @bamba. Also, I want to direct you the https://www.youtube.com/channel/UC61WgbNdZ_wqxKf9PzJrjgA channel containing Valentina tutorial information.
so that you may see some of the video tutorials that already exist. Please check this forum again tomorrow and I will have posted a simple text based tutorial for the elastic waist skirt in valentina
In general, you are encouraged to pick a patternmaking system, buy a book, and learn to draft patterns. The valentina software is a tool and you can use it to do many things but it does not replace patternmaking knowledge. Your example (the skirt drawing) and the tutorial that bamba posted are simple enough that I believe it is a useful example.
It is unlikely that you will find anyone here who will create step by step instructions for every project that you may want to learn to do, but it takes some help to get started and I am more than happy to help.