Who can help me find some website to ad my products?

[Enzo]

[Samoil]

What are your products? You need to target sites that have an audience for your products

[Jake]

Some greater details as to the sort of product and whether you just want a few free prospects or are willing to pay for broader exposure would help you get a better answer.

Craigslist.org can be good for a few local sales, Google's Adsense or Facebook can be good self serve ad systems for first time users, there's a Google voucher around matching a $25 investment with an additional $100.