Are you planning to run a signature campaign?
I think he has a higher rank alt participating in a signature campaign
and he wants to pay people to do the work for less than the campaign pays
Probably you're right. OP probably have account in signature campaign or just planning to join it, but he isn't fluent in English and can't post. So, he is probably looking for someone who will write posts for him and he will give part of signature campaign payment for that. OP, let's say campaign is paying 0.00015 per post, how much you're planning to give for every post? High ranked accounts won't be interested in your offer, but lower ranked users who can't join signature campaigns might be interested. But dealing with newbies is always risky because it's very likely that you will scam person who are working for you...
Forget the rate, there is high chance that user will post plagiarized content from OP account. That will be the end of road for OP in this platform.
OP, Why not join some English teaching class or take help from refresher book that is available in your country.