Freewriting is nothing more than what it says, to write freely, without the inner critic or the grammer police intervening. You can start with or without a prompt (a picture, a word, a topic, a thought) or just set the clock for 10, 15 or 20 minutes and just write …
First, consider what topics there are you'd like to write about. Then take one of those topics and do a couple of rounds of freewriting, formulating all of the association you make with that topic. Now pick out the sentences that draw your attention. Write those down and put them …