Sometimes called 'automatic writing', freewriting involves setting pen to paper, or fingers to keyboard, for a timed period, often in response to a 'trigger' word or phrase. When you freewrite, keep the pen/fingers moving, don't look back at what you've written or edit; if you don't know what to write, write 'I don't know what to write' until something comes to mind.
It's a bit like going for a walk with a pen, it can help you get started, generate ideas, cope with feeling 'blocked'. Being freed from the constraints of grammar and syntax can be liberating and, paradoxically, this loose, unstructured writing can help build confidence and improve your writing.
Congratulations on your first freewrite!
OK, now you have 2 or more freewrites
OR ... do another freewrite until you are happy.