Need to develop the shop system Using TYPO3

Im very new to this TYPO3 CMS. I have downloaded typo3 latest version 4.5.2 (introduction package).

I need to develop the webshop using typo3. I have downloaded and installed successfully.

Both Frontend and backend are working good.
It looks like general site. But, i dont know how to convert it to webshop.
Here i got strucked. And i tried by downloading the tt_products_2.7.1.t3x extension, i have installed it too.
Though these extension might not viewed or displayed (any product) or (made any changes) in frontend.
But, my database got updated with new tables with no data.

I dont know what to do?
Need your support/guidance.

This is my need
I want develop the shopping site. Using TYPO3.
Please let me know in detailed.
what are the neccessary requirement to do so (via TYPO3)?

Waiting for your COLOR=“Red”[/COLOR] reply,