I would look at Cap One, Merrick, and Discover for unsecured credit card prequalifications.
Three credit cards is a great start just don't rack up to many inquiries to get them.
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Your student loan is considered an installment loan. You do not need a credit builder loan. If you follow the previous post and get three credit cards along with the student loans; you will be fine. Once you get the cards, let them age for about a year before seeking new credit products.