also cosmetic or accessories or books and etc...What you sell is not that important,but make sure to focus on your advantage.
If you really wnat to find the niche market... you better do the research on ebay, amazon and dummize.com
You can sell almost anything as long as you offer an advantage for the clients. The question you must ask yourself is: "Why would anyone buy from you and not from others?"
For me selling second hand phone online is better choice. But if you prefer small investment then go for handphone dropship.
Personally I've found some success with the PUA and seduction niche. Guys looking for that stuff are usually desperate enough to shell out for anything.
If you are going to do a "store" concept, I seriously would recommend adult and a clip store for newbies. It is simply easier to get rolling, and better to learn the business short term. Once you have learned about SEO, SERPS, driving traffic and alike. Then you are better suited to try your hand in the mainstream arena. Going into it without the basics will force you into over reliance on AdWords and other costly advertising business models. Which, if you do not have the budget, will almost bottom out your boat from the get go. Good luck.