I learned that if you want to start a rose you don't do it from a seed. Everything that I have read about starting from seeds pertains to making a new rose breed.
I've never tried growing comercial roses from seed, but I've started several wild rose species and the ones from lowland areas (the ones around here anyway) seem to start without any treatment after a 2-3 of weeks.
That's all I've ever done and it's worked for the ones I've grown.
And it is so much easier.
I place twigs of wild roses into the ground to learn, but I'm certainly not an expert.
Also, forgive me if you know all this aready.
There are two parts of a rose, the base root and the graft.
The base is from a plant that is resilient, and has a powerful root system. Wild roses are just that. If you wish to create your own roses, you'd grow some wild roses first. Growing wild roses from a variety of methods should be easy, they grow like weed and are fairly resilient. Use seeds or clone them.
The graft is the noble rose. They are not usually very resilient and nobody cares to grow noble roses with a strong roots, so a noble rose with its own root would be a feeble creature indeed. Instead you grow noble roses by grafting. From a rose you like (smell, look, built) you cut a twig and place into the root system of a cut-off wild rose.
This is grafting.
Afterwards, you keep the root system of the original wild rose in the earth, only letting the nobel rose protude.