Apply karala iwara unata passe machan..mam danna widiyata un application ekat blanwalu.4to eka ehema awul nam application eka reject karanawalu..draw eken passe apiwa select wela nam mail ekak ewanwa..
No they won't send you anything

keep your confirmation and check after winnings are announced. even if you were selected. You also have to be inside cutoff point (if there're 50,000 winners on 2017, available visas for 2016 is 30,000

your number should be below that. )
Don't even apply if you do not meet the entry requirements ALs or relevant work experiences. Because you have to pay 400$ processing fee prior to interview, US embassy will reject your entry if you're not qualified!

And before the interview you must find someone to sign affidavit of support for you.
So this to work you have to be extremely LUCKY
Good luck though..!