Hi,
1.First you identify unique products.
2.Then you research the cost/profitability ratio.
3.Then you list with lowest possible margin at fixed price.
4.For auction, you got to buy stuff at wholesale from local market and keep the lowest possible start price, may be lower than market rate, to make it attractive. Please remember that auction may be a losing game. But auction only can make you rich and famous.
5.Please remember that you are your best teacher.
Wish you good luck.
Thanx,
Truly,
Amitava