after a agent is chosen(urself), u can pay AOS fee $120. but to pay another IV fees, u need to wait for around 15days. Later, u will get a email in the mailing id u provided for agent which is urself in ur case. then after u will be able to pay IV fee of $325.
Me n my fren were in same situation n confusion for over a week not being able to pay IV fees n proceed ahead. just got the mail yesterday n paid the fee today. hehe..