I work as a freelancer and part of my work became content writing. I was very lucky to be picked up from a London agency It takes a lot just getting the content right for the right audience. It took almost four weeks to get to the part where the content will be used.
Fiver freelancer upwork any others
You don't have to pay until you are happy,i would take full advantage of that.Give a good detailed brief and plenty of time. Use star ratting as a guidance. If you can try to have contact before you start jobs definitely worth using that. One though try these words "long term relationship rather than one off".
I have at the same time used writers and had great results. Common sense dictates on getting work done well. If it looks to good it probably is.