You say you have been playing guitar for many years, I would assume then that you know your theory to a basic standard. The hard part then becomes translating that to a keyboard and, as Beep says, getting your hands to do what your head is telling them. As a piano teacher of nearly 40 years I can tell you that hand coordination
only comes with practice and playing. The theory of white/black keys you should be able to get from a good book, or internet site, but a few lessons from a good teacher will stop any bad habits forming early. Good luck, music is not a hobby, it's a career choice, and what you get out of it depends on what you put in.
My favourite saying of all time, and the one I have 'blue tacked' to my piano, is "never let a note go by uncared for".