Question
what kind of soil is needed and fertilizer? Is Feb.better than Jan to transplant them? also How much root system needs to be taken? Should I prune them before I dig them up?
I look forward in hearing from you.
Sincerely   Doris

Answer
The best time to transplant in your area in when the temperature is the coolest. Ventura seems to be a little cooler in the summer as well as the spring so that will help with the move. That means try and do it as soon as possible. I am assuming here that these roses are mature and so have a lot of growth on them. In a perfect gardening world you would have the rose holes in Ventura already dug. What causes problems with transplanting is often the roses having to sit around for some time before getting into the ground.This starts the roots dying.
Water the roses very well the day before
Next day cut them back to 18 inches tall
Try and dig up as much of the top of the roots as possible. The deep one are mainly anchors. You can't help but damaged the frail feeder roots but many are near the top so that makes it a little easier to save them.
Place each rose in a black garbage bag that has wet newspaper in it. Tie it tight over the top of the rose if you can.
In the new holes place a cup of bonemeal into it and mix with the soil. This will give the new roots something to munch on for a few months.
Then fill the hole up with water and let it drain. Dry soil will kill the new feeder roots.
Plant the rose the way you usually do and firm the soil around it.
Because you want feeder roots as soon as possible, always place a mulch around the base of newly planted rose bushes. Roses do much better with cool roots.
It will take about 6 weeks for new feeder roots to grow and take up water and nutrients. Because they can't do their job don't use any fertilizer as it will just be wasted. You want the bacteria in the soil to break down the nutrients for the new feeder roots and fertilizer can discourage them, unless it is organic.
You will have to water, water, water for at least a couple of months until you get new roots.
The roses may droop and look sad but just ignore their complaining, as some may take until the next spring to get going again.
I really don't think you will have any trouble with the transplanting but if you are concerned or have some rare roses that you can't replace, just take some cuttings off after you cut them down. Cuttings can stay in the fridge wrapped in wet paper, until you have time to deal with them.