Next step is to transfer your mined coins to :

• Poloniex
• Kraken
• Hitbtc (easiest for beginners)
• ...
  (Choose one to start with)

and start trading them with profit.

Second thing is to keep mining for another week, if you're still into it make your own rig,
1500 = way too much!
Start with 1 card (I use AMD rx480 and rx580, be sure to get 8gb cards, GTX 1070 also has a good ROI).

Next thing: start reading cryptonews, and don't get hyped by someone else.
Join a thrustworthy group (facebook, Reddit,...) of likeminded and listen, learn.

Last tip: when trading, please don't trade with emotion, sometimes it's good to HoDL! (Search Google for the HODL story)

Good luck!