Either buy plants or get seeds of single, NOT double blooming plants, avoid the black one as I think that is quite a recent type. I have been growing from seed for the first time this year, using Antwerp Mixed plus some other mixes. The plants are now about 10cm tall and will flower next year. I have no idea what colours they will be.
I suggest that you also get Delphiniums for the height, Lupins if you have the space; they have a short flowering period and I don't have room for them.
Thanks for your information.