Welcome to HealingWell, Carrierae328, I do not have gastroparesis but here are some websites with more information.
The first one outlines a diet program which has steps to follow starting with a very stringent food list, then adds certain food in another step, and so on. Maybe this is useful to you: http://www.digestivediseaseny.com/nutrition/gastroparesis/
And this website also follows a step-by-step plan although it seems slightly different:
http://www.nutrition411.com/education-materials/allergies-intolerances-and-special-diets/item/471-gastroparesis-guidelines-tips-and-sample-meal-plan
I hope someone who knows more about this can post some replies. I'm sorry I can't help more.