I want to make some bags,I have them plain,but want to print on leather
Which method is best for that?

They have special inks for printing on synthetic leather/rubber. I'd see if you can use it with silk screening. I know most spray paints stick to leather not sure about synthetic. Try it.

There is an special spray paint for synthetic material, you can get it at any home depot I think

can I use dye sublimation or what you recommend me?