At an industry or trade event you may have been invited to speak on a specific topic whereas at a local event you could offer to speak to a group for a short amount of time
Now that you have some experience and are comfortable you will want to offer to write a guest post for another blogger. Search out someone in your field that has a large following of people and simple ask
Once you are able, write an article on an area or item that you want to share. Don’t worry about making the perfect post and having a beautiful flow to the words. Just jump in and do it.
You are an accumulation of all of the experience that YOU have received, all the training and conversations and moments in time that made you who you are today.