You are asking basic questions here...pls go through the forum first page Traderji.com you will find different section/forum for discussion...go through the respective forum/section of discussion which you are looking and you will get answer...
If you have Amibroker software then search in google for RT data and you will get so many Real Time Data vendors...take trial from the Vendor and if you feel/like the data quality of the Vendor go for subscription. Pls dont ask me which RT Vendor am using as posting the same is not allowed and am no way recommending any RT vendor here!
Hope you understand!