BANS = Buildanichestore script. You buy the script, decide on a niche, setup the site with the script, and if you don't already have an EPN account you apply. Though EPN isn't approving people quickly lately. Then you have to promote and market your site just like any other site.
I use Joomla to build my bans site which is an open source content management system. You can use RSS feeds from eBay to display on your site. I believe the BANS script costs about $97.
laxmi it will probably take a little time. BANS stores are getting de-indexed quick by google. Every single one of my BANS stores has been de-indexed. If you want to spend time on your sites then get it and you'll make money. It isn't a get rich quick type of script at all.
By purchasing advertisements, using PPC, etc. Or spend a lot of time to make your BANS site not look like a BANS site so it doesn't get de-indexed.
BANS used to be a sure-fire money spinner with people "rinsing and repeating" niche sites by the dozen. However, Google has been characterising these as "thin affiliate" sites lately, often with good reason as they are nothing more than cookie-cutter sites with little or no original content, just auction listings. So it is difficult to produce a BANS site Google will like. Although I was annoyed to get my best-performing eBay niche site (not using BANS, but my own WordPress plugin - same sort of thing though) de-indexed, but in a way I am grateful as it has forced me to look into more imaginative uses of the eBay feed and API which will ultimately lead to more sales I hope. So I would think twice about dishing out the money for BANS, unless you really intend to invest in your BANS sites and that means some serious work. Better grab my (free) plugin, or something similar and make a little WordPress-based site with a .info domain or something, and get a feel for how it works and for how much effort you need to put in to make it successful (=Google-friendly).