CAD Software Suggestion

Hello Forum,

I am in Men's wear clothing business. I am fabric cutter, stitcher and pattern maker. I have much knowledge of computers. As nowadays, computer is replacing man in every field. In my business also there is much competition with computer designs. I want to learn CAD so that I can make various fabric designs, patterns, etc. in short time. But don't know which CAD software should I start with : Corel, Photoshop or something else.

Please Digitians, suggest me the way.....!!!

Thanks !