Q.Slip of a Rose
I want to take a slip from a rose and start a new rose.

It takes some very real patience to do this for most folks but those that have done it for a long time have gained on the successes. Keep in mind that most rosebushes are grafted roses. The top part is the rose we like and the bottom part or root stock is a much hardier rose. Thus when we start a new rosebush from the cuttings, the new rosebush may well be too weak on its own roots to survive. Especially if you live in a cold climate area. Here is a link for you on the subject and best of luck to you:
https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-from-cuttings.htm