You need to create 2 chord sequences that are different, one of the verse, one for the chorus

I suggest each chord sequence has 4 chords

Make each chord 1 bar long

Look at the chord resources at the bottom of the page to choose your chords

Once you have created a chord track you can now add an arpeggiator to it, this is good to add texture

You need to pick 4 chords from one of the black boxes below

You can use any chords that are in the same black box

Look at the notes in each chord, so you know which keys to press