Demo accounts are being broadly used nowadays throughout the Forex industry. They're popular because they're easy to use and often free. Typically, when you partner with a brokerage company, you will receive a demo account already active and ready to go. I always suggest finding a demo account through a brokerage company so you can have access to trading education, advice and guidance.
Day trading can be a tough business to get into and is only profitable when traders take it seriously and value their education and support system. It should be considered only as if it was a job: not a hobby. So, it should be taken seriously and as a trader, you need to be focused, attentive, and attach yourself to mental preparedness.