1) Trim off any unnecessary portion of the herbs
2) Thoroughly wash the herbs to save you time in the future as well as ensure that there is a little moisture around every plant. Remove excess moisture with a salad spinner.
3) Lay the herbs out into a single layer on a few paper towels
4) Roll it up like a, well, whatever you have experience rolling
That should at least triple the life of your herbs as compared to keeping them in a plastic bag.