Creating a website is a cheap and effective means of starting a business with limited resources. Use that to sell some form of:
1-Service (social media consultant,etc)
2-Training (how to do marketing in X niche)
3-Online Course (how to pass ABC101 that you had in your course)
The formula: What problem/irritation can my knowledge base solve. Package this solution as a product/service, that can be monetised. Sell it.
Read the 4 hour work week:
http://www.kalahari.com/Books/The-4-Hour-Work-Week_p_40073988
Video Summary of the book:
https://www.youtube.com/watch?v=j3TeLsaKzAM
This book, "Rich Dad-Poor Dad" and "How to win friends and influence" people should all be required reading in school. Also they should have taught us how tax works, but I digress.