Hi,
I understand this is not simply a content writing position; it also includes some data entry and monitoring of your products on eBay, managing social media and an accompanying blog. The project sounds very interesting, especially the promise of diversity in tasks :) and I feel confident that I can do it perfectly!
As for my experience here, I've mostly done content/article/blog writing, audio/video transcribing, data entry, translation, various administrative tasks, etc.
Regarding the payment, seeing that the work implies different tasks, that require different amounts of time and are of different complexity, I would suggest this to be an hourly project. However, I am quite okay with your proposed bi-weekly payment dynamic.
If you have any questions about me or my work, I will be happy to answer. In the meantime, check out my reviews and kindly consider my proposal.
Kindest regards.
Isidora