i want to know where i have to registar to build my own forex site then from where i have to buy MT4 Platform and how much money is monthly cost to build a new forex site?

Answer
To build the site you would need a domain (basically a name of website), you can go to godaddy.com and buy a name (will cost you 10-15 USD per year)

Then a hosting company which will host your webpages ($10-$15 per month)

What website is the best to practice Forex trading?

I'm interested in learning about Forex trading. What website would you recommend to practice and learn how to do it?

Answer
Try fxcm.com, Practice accounts, training, 24/7 support, and Micro accounts with trading down to $50 up to $100K per trade.

Looks easier than it is