Best color palette is the one you make your own during the proces. Best starting objects would be any household object in your surrounding that you can watch while you are drawing.
Next step up is to try to get into more organic shapes, like those from flowers or vegetables, again watch them in real life.
If you are up for the challenge, either learn about anatomy and start drawing humans or animals, or learn about composition and start drawing scenes containing multiple objects in a specific location.

You post everything you make on the WIP forums and we will guide you with the colors along the way. Good luck have fun now go and draw.