how to start developing in handspring (treo 600) pda

[Nisar]

hi, im very much interested in developing a very straight forward application
which display some simple text and some graphics.

i would like to target my application to all PALM OS for now.

i don't know from where to start and how to start but I do have very solid
programming experience in asp/vb/.net

Please list down what do i have to do and i know i need simulator but where
i can get the simulator for handspring Treo.

Thank you