Setting up a google ads campaign with maximum effectiveness

I want to set up a google ads campaign for my business with maximum effectiveness. i have tried it in the past but it hasn't worked so well for me, I got very little online impact from it. So I need someone who has a better understanding just to set it up for me.
www.fift3.net in my webpage for you to get more details about my business and the items i want to promote within my country KENYA.