I was searching for an introductory text on Poisson geometry.I have tried searching it and end up getting -
http://www.math.illinois.edu/~ruiloja/Math595/book.pdf
and after looking at a similar question in MSE I got this one but that is advanced for me though - Lectures on the Geometry of Poisson Manifolds by Izu Vaisman https://books.google.com/books?id=z1r2BwAAQBAJ&pg=PR5&lpg=PR5
But I am a begineer in this and I know Hamiltonian ,Lagrangian . Any one can suggest some good reference so that I can have grasp and can appreciate Poisson geometry.