If you highly educated and interested in working in the education industry, you can also create educational videos and courses and sell online. If you are expert and good at teaching, you can make relevant videos and sell online to companies like Udemy.com, Lynda.com or skillshare.com. There are lots of interested students who want to learn and are willing to pay for the courses. You can tie up with such websites and sell your courses online.
I think it’s funny how 1500 is the amount of extra income you mention because that’s what I’m shooting for! If I can make that much more each month to supplement my regular income, I will have almost all of my school debt payed off in one year! I’m really motivated. I use Mechanical Turk with Amazon to perform menial task and get a few extra bucks. I also use Varolo which is a fairly new idea. I really think it has potential. If you don’t mind me promoting it, here it goes.
One of his favorite tools is Personal Capital, which enables him to manage his finances in just 15-minutes each month. If you sign up and link up an investment account with $1,000+ within 40 days, you get a $20 Amazon gift card. They also offer financial planning, such as a Retirement Planning Tool that can tell you if you're on track to retire when you want. It's free.
In focusing on your wealth management goals, investment income is obviously critical but you might fund your goals from wider sources of income.  A typical long-term portfolio might produce about half its return as income and the other half as capital growth, though in times of duress the capital growth component wanes.  In this low-interest rate climate, some sources of income have become quite expensive and may prove disappointing against your spending needs.  But by tax efficiently and sustainably drawing income from wider sources, you might meet your goals while more prudently balancing risk against reward.