Since there is not much to speak about your experiences in other jobs, you have to sell yourself on the following:
- If you are just out of college (or school) and have an educational background (formal or vocational), you should walk in carefree. You are not expected to have any experience. The very fact that you have been called to interview means that the company is aware they are hiring a fresher.
- You can talk about help you may have provided to a friend or family member regardless of whether you earned something for it or not. It shows your character. And the company will hire people of good character over others, given the same amount of non-experience.