Go onto a chord site like ultimate guitar and start learning some songs you like.
Take a look at the chord diagrams and start training you hands to get used to the fret-board. When you know a few shapes you can take a look at the caged system, there has been a few posts relating to that system recently.
After getting used to a fret board, your piano will start kicking in.
Edit: The reason for learning Chords and Caged first IMO is for you to be able to find any chord across the neck and solo using the chord shape as a start.