Backpackers and border crossings in Asia?

Question

I want to backpack through Asia... I don't want to fly, so what kind of things do I need to do to prepar for not having much by way of proof of onward travel. Most contries require proof that you are going to leave, but...If I go by train, bus, boat, etc... I don't know how to show this... advice?
I want to buy as I go

Answer 1

Get an open-jaw ticket with an open return date.