Credit question buy a house?

i wanna buy a house me and my husband have one credit card together. our credit is in the low 600's right now. we have some debt that will be paid off by the end of the year. should we get another credit card to improve our rating or is our one credit card enough. by the way it has a 500 limit. i know it will... show more i wanna buy a house me and my husband have one credit card together. our credit is in the low 600's right now. we have some debt that will be paid off by the end of the year. should we get another credit card to improve our rating or is our one credit card enough. by the way it has a 500 limit. i know it will take a while to improve our score to be able to buy a house--but if we can do anything else that will help let me know! thanks
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