First time home buyer

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Looking to buy a property within the next 6 months. Have minimal credit though. 1 secured credit card, 1 regular credit card, and an authorized used on a credit card. Credit score is saying 680, with just a year of credit history. What are the steps I should be taking to prepare for buying a home within the next 6 months regarding my credit? Will lenders be okay with this? Also will have 3 years of tax returns.