automate my online business - eBay/Amazon/Magento/Facebook

Hi and welcome to my listing: I will give you a rough idea of what I am after and if you think you can help then please get in touch. I run a small business from home, all my products can be sold online and sell mainly on eBay, Amazon and my own website (magento). Its a very simply operation, customer purchases the product, I mail it :) The problem I face now is I need to basically have it run itself, I am moving to Costa Rica for 3 - 6 months to do some volunteer work but need the business to carry on. I will have basic 3g service so I will be able to reply to customer questions, leave feedback and follow up emails etc. I'm think about using Amazon fulfillment programme, I sell anywhere from 20 - 50 products a week and they are pretty much the same besides having different designs. What I need is for someone to help me set it all up, I need a programme that controls all my inventory, works out all the tax, payments etc, like I said earlier, runs itself! I need it to do everything, all I want to be able to do is order the stock and send it to Amazon I'm looking for someone trust worthy, excellent feedback and knows they can do the job. I've had to many bad experiences in the past with freelancer so please only bid if you are serious and can back it up. I am not leaving till November so theres no reason not to do this properly, I can pay monthly as and when we progress. If anyone feels they can help then please get in touch. Kind Regards Matthew (ps, I also have a facebook store (bugle) but I don't know if it will be possible to incorparate)