I hope this helps. I spent seven years in the print industry and have a few suggestions:
Merely scanning a color is only a partial solution. Scanning has too many erroneous byproducts (artifacting and moray patterns for starters) causing a great deal of inaccuracies in the color.
Should you decide on this method, the scanner itself should be a higher quality than your standard retail model, but I wouldn't recommend using one.
My suggestion is have your monitor calibrated first, then purchase a PMS colorswatch (from pantone) with traditional names printed on it. They are pricey, but worth the accuracy they provide. It's also an industry standard and if you decide to work with anyone else then you'll both be on the same track. Another cost effective solution is to purchase the paints and create your own traditional swatch. In Photoshop, pick a color from the swatch that's close and open the color picker. Use the swatch against your monitor as you calibrate the color picker by dialing the numbers in directly and using the arrow keys to jog the numbers up and down. You'll not only get an accurate representation, but your expectations will almost always be met for output. If you're colorblind, then bribe a well-visioned friend (of legal drinking age) with a beer to assist you, but don't let him have the beer until after the calibrating, otherwise you might have well scanned in the first place :-)
Anyway, a bit windy, but hopefully helpful.
"Do or do not, there is no try."
YODA -- a long time ago...