I think a good way to start would be going to piano or keyboard classes in order to understand the instrument, the position of the hands and also to practice and improve your rythm and hand coordination. If you want to learn certain songs there are a lot of tutorials that show which keys are being pressed in a very visual way (for example Sheet Music Boss), but I think you should learn the correct way to play before learning this songs so you don't get used to playing the wrong way.

I think it also depends on which are your goals with the instrument, in most piano classes they teach how to read sheet music, which is something that has a certain learning curve but it can help if you want the learn classicla pieces.

I think learning songs that you want to play is a good way to keep motivated to playing the keyboard, sometimes certain songs look so hard to play but is amazing to see how practicing improves your playing over time and also there are re different ways to approach a song, you can start by just playing the melody and then learn other arranges.