Hello,
Appreciate your long detailed project description. Not often does one come across descriptions in such detail. Reading it makes me happy too, as this is something which is after my heart! To give you an idea, I love writing and am well-versed in writing for the web, having spent 18+ years developing websites and writing SEO-optimized content that has seen those sites feature high on the search engines.
Besides, I teach English (on an informal basis) and hence the grammar errors and issues of spellings and sound language that you mention, would be well taken care of.
Recently I have written articles on various subjects (and varying lengths) and they were well-received enough to fetch me repeat jobs. These articles had passed the plagiarism checks like Copyscape, etc. Also, the language I write in is easy-to-read yet communicative and meaningful as my work requires teaching children and adult low-level learners.
I have just made a small beginning on the Freelancer platform and want to thrive on it for as long as I can, so when it comes to working dedicatedly and punctually, you'll have no complaints. Will be able to adhere to your deadlines too.
Based on the remuneration I received for my recent work, I have given my quotation. I would rather write quality stuff than write 4-5 articles in a shoddy manner, which is also why I don't opt for low-paying jobs. Having said that, I obviously would welcome long-term work. Shall await to know about the content that you want.