yeah, 500 dollar limits are good for people starting out with atleast 40 hours of work.
i think the best thing to do when you have a credit card is look at all your bills monthly (including alcohol and weed) and subtract that from what you make monthly.
the amount you have left over after that should be the amount you will allow your credit card to be up to.
i know no matter if i max my card out, i can pay half of it off in 2 weeks if need be. i always pay more than the minimum, at times i pay 5 times the minimum