I want to know how initial elo is calculate

Are tacken into consideration the games form the last year or of the last 2 years?

If I played only 2 elo games in a tournament, it counts or have to play at least 3 elo games?

Nobody knows the answer? :(

Yes, initial FIDE rating

Games played 2 years ago count or not?

http://www.arbitriscacchi.com/regolamenti/B02.pdf

7.14c The condition of a minimum of 9 games need not be met in one tournament: results from other
events, played within rating periods of not more than two years, are pooled to obtain the initial
rating.

http://www.fide.com/fide/handbook?id=73&view=article

8.21 If an unrated player scores less than 1 point, or he plays fewer than 3 rated opponents in his first rated event, his score is disregarded. In the subsequent events all results, even a zero score, or fewer than 3 games against rated players, are accumulated to his initial ranking

This document explains in detail how the USCF does its ratings (including initial ratings for someone's first tournament). I imagine FIDE is very similar if not the same. http://www.glicko.net/ratings/rating.system.pdf