You'll probably get by with a good quality electric piano for a while but if you want to make real progress then you're going to have to get yourself fixed up with an instrument. Although the electrics have all sorts of gadgets like weighted action, touch sensitive keys and even sustain pedals, the feel is never the same.
Lessons, depending where you are and who your teacher is, you'll be looking at between �10-�20 per hour.
This is quite a useful resource to start with:
http://www.uk-piano.org/piano_teachers/index.p hp