Ummm, you are asking for quick, freebie YouTube videos on how to make complex and delicate gumpaste flowers? That is totally unrealistic. Gumpaste is an expensive craft to get started with, because you buy specialized cutters and veiners and other things like stamens, floral wire, celpins, celboards, ball tools, petal dusts...etc etc.
Buying a Nicholas Lodge DVD as the other poster advised is your best bet. A month ago, I just purchased several of his DVD's, including the Tropical Flowers DVD which teaches all of the flowers you mentioned, plus all of the cutters and veiners to make the flowers on that one DVD for about $300.
You wanna play, you gotta pay.