There are free tools online that can assist you with your writing. For example, check out Grammarly, it will automatically show you mistakes even on the free version. You can also install the Grammarly Plugin on Chrome and have corrections shown across websites, which has helped me a lot throughout my content creation journey (I am not sponsored by Grammarly
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Another way to get articles - as pointed out by other people in this forum - is to approach freelancers/ ghostwriters. Keep in mind that this may get expensive over time if you need many articles, so I think the learning-by-doing approach will definitely benefit you in the long run.
Let me know if you have questions and I will be happy to assist