Don't get some cheesy keyboard with a self teaching, key lighting mode - you'll be embarassed about it before long. I'd get a decent synth, with some good knobs to twiddle, and then set about finding a teacher. Please find a teacher, one who plays the style of music you want to play. Don't use a classical piano teacher - as you'll get frustrated, and most likely will give up. Check out the cards on the board in the local music shop and find a decent teacher who you get on with, and who inspires you. Then you'll go far.
And learn your scales. Most important thing ever. If you can play all your scales, you can play anything.