As a copywriter, you will be mostly writing articles for SEO or ad copies. 

Also, with copywriting you can create your own website and write different reviews and rank them on google and earn money that way.

Computer;
Data analysis;
Ability to write.

$1000-3000 monthly

✅ Easy to start

✅ Cheap to start

✅ Profitable skill

✅ Can be scalable

❌ A lot of competition (depends on the place you are living in if you are trying to promote locally)

❌ Fatigue

❌ You might encounter a creative block

You can find clients on local classified ads or you can create Upwork or Fiverr account and start building your portfolio and client base there.