Whether you have ten thousand words or a million inside you go for it and either upload it as a free eBook if you think its good enough to one of the many sites or just leave it for your kids or grandkids to find and have something nice to pass on through history.
Never start writing thinking about the money side, there are thousands of books out there which have never sold one book, you may get lucky, but without investing the same amount of time in marketing you will never get anyone to even open it, so do it but do it for fun.
My first novel was fun to write, I released it on Kindle and never told anyone, for the first three months I was so happy just to see it there, just like a proper book, even though I bought the only copy. I am now half a million words into my second novel and still loving it.
I may have not made a penny from sales but I have a much broader vocabulary and have saved at least two hundred dollars by not having as much time to read anymore.