fast track
Dear Rise-up,
unfortunately, Emirates doesn't consider previous experience. You will get your upgrade based on your seniority, performance and attendance.
(However, Etihad Airlines considers your background. If you worked for NOT low-cost airline, you might start working in premium cabins right away. They consider your years when you apply for the Cabin Manager position when the aircraft type you flew on before and previous management role is more important.)
Although, there is a good chance that you will be put in the A380 fleet as you have a flying background. (The new 380 ab-initio groups are full of experienced cabin crew. The average age is also a little bit higher in these groups.)
If you work hard and you have an excellent attendance record, you can become SFS (a.k.a supervisor) after 3-4 years. You might become Purser after 6-8 years.