How to raise credit score with Credit Cards???

My credit score just jumped from 583 up to 640 in 30 days because I just payed off an old debt and it was a pay to delete agreement so it was completely deleted from my credit report. yay! I'm on my way!!! Now, I'm focusing on using the credit I already have to help raise my credit from here on out. I have 2... show more My credit score just jumped from 583 up to 640 in 30 days because I just payed off an old debt and it was a pay to delete agreement so it was completely deleted from my credit report. yay! I'm on my way!!!

Now, I'm focusing on using the credit I already have to help raise my credit from here on out. I have 2 credit cards...one is an Express store card $250 limit, and one is a Discover card $300 limit.

I have only had my Discover card for about 6 months, and have used it every month (sometimes to the limit) but I pay it off COMPLETELY every month. My Express store card I have only used 2 or 3 times, and I've only had it for maybe 5 months, but have not used it at all in 3 MONTHS!

My question is, how should I be using these cards for the sole purpose of raising my score?

I have heard that spending too little doesn't help, but spending too much isn't good either...does it really lower my score when I max out my card BUT pay it off completely when the bill comes?

ALSO, I called my Discover Card comp. and they said that they report to the all 3 credit bureaus every single month on the 10th-does that mean that I should pay my bill BEFORE the 10th to have a $0 balance, or will that hurt my score because it will look like I'm not using my card at all?? So confused!

After I begin using my cards correctly, how soon will my score begin to rise and how much will it go up? I just thought improving my revolving debt would help improve my score more than anything I could do at this point, and also because it's one of the big factors in how credit is calculated..I read.

So confused, I just want to learn how to use my credit cards correctly. Any insight would be much appreciated! Thanks in advance =)
Update: I checked and thankfully, my EXPRESS card does report to all 3 credit bureaus..
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