I bought a ticket online but I need some help…?

I bought a ticket from Alaska Airlines but I couldn’t reserve a seat. I called Alaska Airlines and they said to do a web check-in 24 hours before my flight leaves so I could reserve a seat… But do I have to still print out my ticket at home or can I still get my ticket from the kiosk at the airport? If I do have to print it out at home, how does that work? Sorry for the somewhat ridiculous question, I’ve never bought an airline ticket online without reserving my seat before haha And Thank you so much for the help. :)
But if I get a paper ticket at the airport… Why would I have to print something out after I do a web check-in?? I’m so confused.. haha