3) Upload your inventory. Pretty simple. Unlike eBay, professional looking photos look good, convert well, and show relative size. Things like getting good photos taken of a small child holding a pillow you are selling is cheaper than you think and convert very well. You focus a lot on conversion rates and stuff once you have your own sites.
4) SEO, if you don't know how to do it... hire people. I hire westerners, I've been though probably 50 eastern SEO companies and don't really have any good stories to tell, I'm just not too impressed. I get an SEO team from the U.S. on a project, its usually done quicker and I get better results. Don't skip out on this. People think that they can skip out on marketing, but you can't. In the beginning your marketing budget is going to be pretty high. If I started a site and I brought in $10,000 my first quarter of profit, I would probably reinvest $4,000 of that on further advertising until I get to a position where you are more sturdy about the traffic coming in. Once you are comfortable, don't decrease your budget, just do not increase it and see what you can do to get a bigger bang for your buck. You need traffic.