Sharon, the "new style" button is right under "okay" and "reset" when you go to add a stroke

If you have a style you like, you can just hit that button and it will add it to your style palette, so next time you can just select it directly from your palette (which I always have up). I never use the color codes, I'm much too lazy, I just drag the cursor to the upper left. If you want the stroke to be different sizes, you have to manually change it or save several styles. There is no way other way for PS to know what your intended stroke width is.