Hi phm,
I'm totally in the same position as you, knowing songs but needing a path to go along. For example today playing along with Lisa and pretending to be Johnny Cash with those root notes on chords. Before this I was hitting the wrong strings on open chords for years and not caring. So having that slower strumming discipline has been interesting and helpful.
And very soon we move on to power chords, familiar but should be great fun.
You have another musician in the family ? Lucky you.
W (aka Warren)