When I got my first 2 cards, their due dates were 2 weeks apart from each other. As one got near the statment cut date I would make sure it was PIF prior to that date. If I had to charge anything durring that time I would put it on the other card and so on. Just my 2 cents.
Congrats on your Disco approval. The above posters were correct. Once you start to get more cards. It will get confusing. I have 1 card with a mid-month statement date I use only when my other 7 have the same statement dates between the 1st and 4th. I worked it out that way. I use each card each month. One payday is cards. The other is rent.
Once you get out about 4-6 months since Disco. Go for the third card for the rebuild FICO bonus. FICO likes less than 50% of your cards reporting a balance. Just some examples as you grow the cards. Good Luck!