I prefer to work on a commission of 10-13% as stated in your project. rather than an hourly basis.
I have 5 years of experience as a USA eBay seller, though I can sell on any eBay site. I have several eBay accounts including eBay ID sandy10475 and talk2thepaw2day. One is international, one is US only. Both have good feedback around 1350 I have references from others I've sold items for on eBay.
Lots of experience with spreadsheets in google sheets and with customer service. I have a 10 year old verified PayPal account with no restrictions whatsoever. I will list and sell your items, handle customer inquiries, upload tracking, and whatever else is needed. I have fairly high selling limits which can easily be increased as we go along.
Thanks for reading my proposal!