That completly depends on what you can and what you want to do.
Just a few ideas might be:
- You could try to sell Microsoft products.
- You could become an expert in some products and offer your assistence (e.g. as a software developer)
If you want to run your own company, maybe you want to have a closer look at the partner page of Microsoft:
http://microsoft.com/partner
But of course: This forum is covering Microsoft Learning Courses and Microsoft Certifications. I fear that such a question might be off topic.
With kind regards,
Konrad