It’s easy to find writers. Craigslist, freelancewritinggigs, getafreelancer are just three places, and there are very many.
However, while you are “finding a writer”, you will get what you pay for. For each nitwit who thinks Fluther is a suitable place to ask for medical advice, there is an equal nitwit who thinks writers will be grateful for opportunities to work for free. These dunderheads believe “portfolio building”, “exposure”, and “review copies” will be sufficient compensation for writers who have practiced and studied their craft for decades. There will be inexperienced folk who will write for nothing, but like I said, you get what you pay for.