eBay Listing Assistant

I will need someone to help run my eBay business when I am not able to do so as I work full time! I would like help with some of the following:

1.) online arbitrage (sourcing high profit inventory)
2.) update pricing on listings to move inventory (Once a month)
3.) optimize listings (Keyword research, SEO)
4.) optimize title and descriptions
5.) cleaning up old photos and making sure they look their best
6.) responding to customer questions when I am not able to do so
7.) market research (what is selling on the market)
8.) study of competition monthly
9.) interpreting KPI data to maximize sales and growth (Key Performance Indicators)