How to start with an own creation

Hey there, I'm totally new here! Happy Halloween! So to make a short question long, I provide a little bit of context. I'm freshly divorced and found a new girlfriend end of 2025 (after the divorce, to be exact). She's in a wheelchair but loves life, adventures and spending time together in different "spectacular" manners. We live in Germany and ever since it first started she visits the "Glücksgefühle" festival each year. It's the biggest festival in Germany. She loves to have special memory...