What to pay first on a credit report?

I am looking at my credit report and it is filled with stuff that is really, really, really old. I want to pay everything off to raise my score but I was wondering in terms of accounts….how do you know which ones to pay first? Do you pay the accounts currently in collections first?

P.S. I have never had a credit card. My report has mainly medical bills, video store rental bills, and cell phone companies. Thank you for your help in advance.
Or closed accounts?

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