Hi,
The first keyboard that I played was a Casio-701, even though they don`t make that KB, they , and Yamaha both have KB that will teach you chords after you can correctly play , for ex. a C chord then you can start playing scales then a D and play a D scale then do the same with minor scales and that way it will be both rewarding and FUN and thats the great thing about music is the constant discovery of your own ablities. But you don`t have to push it, somtimes playing somthing by hear is just as educational!!