What's the best way to sell oneself in a CV?

I am 22 and I am applying for a number of jobs. The various jobs I am applying for are all quite basic. For example, working in a shop or being an assistant. I have little work experience that I can stress as I've always been more focused on education. I've worked as a waiter, bartender, part-cleaner part-customer serivce, a tennis coach, a delivery driver. I have a weak (2-year) business degree, a tennis coaching qualification and I am a Microsoft Certified Professional. I am continuing on with my studies in computing and I want to advance as a tennis coach learning from home. But as you can see, I'm a bit scattered. I am okay at a bit of everything. How do you think I should focus my CV in applying for jobs?