Start by blanching your fresh green beans using steam. Once they're completely cool, place them in freezer bags or freezer containers. Seal them nicely then put them in the freezer zone. If you don't freeze them well, they'll become rubbery and watery when you cook them. You can check out http://www.bhg.com/recipes/how-to/preserving-canning/freeze-green-beans/ for more details.