Yes, rental income must be reported. Often times, however, it ends up being a small loss which likely lowers your taxable income. Rental Income (and expenses) are reported on Schedule E. Here is an FAQ for how you enter this information into TurboTax: https://ttlc.intuit.com/replies/3288530
The FAQ directs you to download the out-of-state return for the state where the rental is located. However, in your case, Alaska has no state income tax so this is not necessary. (You will be taxed in your resident state, however, if it is not Alaska and your current state does have income tax).
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