Before actively looking to buy a home, make sure to check your credit reports first to see what kind of financial shape you are in. Make sure it becomes a regular part of your life to habitually check your credit reports and score.
Using the avalanche method, your priority would be to pay down your debt that is most costly first. That will likely be your credit card balance by targeting the credit card debt at the higher 15% rate.
Two methods to reduce debt: the Avalanche Method and the Snowball Method