Start from day 1 if you are going to use it. You should do at least 200 card everyday, and you should read the topic before marking it.Here is how I think how it should be used, just my opinion. When you see the card for the firs time, you give it a 1 regardless, then next time give it a 2. The third time you see that card snooze it, and then give it a 3. Give low-yield cards a 4 or a 5, so you focus on what is high-yield. Never mark anything as urgent, and from time to time change what you feel you are weak at from past to current when doing your daily review cards. Using Firecracker without doing these steps, imo, is not that effective. I wish I had started from day 1