Naruto meets Sai right after returning from his mission to save Gaara. In the manga that would be book 32.
Sai is here to replace saske uchiha to complete team 7 and naruto ans sai do not get along and fight just like him and saske.
sai is a foundation member who works for danzo currently sai is in team kakashi, and sai did not try to kill naruto he was testing his strength according to sai
http://naruto.wikia.com/wiki/Sai
Sai is no match for naruto because naruto has resagan and he has the nine-tailed fox in him. naruto can make multi clones and that takes a lot of work. naruto can turn himself into Sai by using his clone justu. So Naruto is way stronger then SAI . Sai thinks hes better than naruto but he is weak
No.
Sai holds it in his pocket.
http://naruto.wikia.com/wiki/Sai
Sai does not wear glasses.
in chapter 286, sakura hears the conversation that goes on with naruto and sai.
well, naruto shippuden episode 1 has sai in it, but only because it is a preplay of the future. the first time that naruto actually first meets sai is naruto shippuden episode 33 or 34.
No, they are allies.