The most used method is “pay per click” (PPC): you create an advert and place it on a search engine. When someone clicks on it, you pay a sum of money to that search engine. The sum of money which has to be paid depends on the key words you used.
The key words become more expensive the popular they are.
For example, if you create a publicity campaign using key words such as: “wedding gifts” or “how to lose weight”, you will have to pay big sums of money because they are very popular and often used. It is recommended to use key words such as: “wedding gifts for men”, “wedding gifts for women” or “how to lose weight with vegetables”, they are less used by the publicity agencies.
CAMPAIGNS PAY PER CLICK (PPC) WHICH WILL LEAD TO YOUR PRODUCT’S WEBPAGE
What is PPC? An Introduction to Pay Per Click Marketing by Koozai
PPC campaigns are very productive but you have to use them carefully because they may cause money losses and also good money if they are used effectively. You should start with 7Search, it is easy to use and the auctions for key words are cheap, with 25$ you can have a campaign for 2 weeks if you choose carefully the key words.
How to Create Your First Ad Campaign on 7Search by Evan Scoresby
Bing ads is also a good promoting source, your campaigns should be professionally built, a higher auctions than on 7Search because the potential of the clients is higher.
How to setup your first Bing Ads PPC Campaign by Chris Groves
Bing PPC how to build a campaign by Joseph Wilson
Tutorial how to optimize your Bing PPC campaign by Joseph Wilson
Google Adwords is the biggest promoter through PPC, here you will find many potential clients, but the auction of key word is bigger than Bing and 7 Search.
AdWords Tutorial 2015 by Isaac Rudansky
12 Steps to Growing Your Business Fast Using Google AdWords | Pay Per Click Marketing by Greg Lane