Making money online?

Kail • I`m 24 and a nursing student. I got married on October 8, 2015. I have PCOS.
My fiancé and I are getting married in 6 months and I'm feeling the pressure lol Since I'm in school full time, I was wondering if there were any legit ways to earn some extra money online? Anyone made money from doing this? 
I'm already selling as much as I can on eBay. Just wondering about other sites.