D.F.
Go ahead and put into a larger pot. Like a 10 or 12 inch pot. You can keep it indoors for another couple of months to keep an eye on it. But if it is in the window and getting alot of direct sun, pick another spot that it will get just as much sun. Try not to over water. Let the soil dry out in between waterings. Water every 3 to 4 days, but don't go longer than 6 days.
You can rig up a something for the vine to grow into, because green beans are a vine. They love to cling and wrap around and move.
My kids have loved growing different plants. At one time between inside ivy's and bamboo plants to outside shrubs and trees I had over 5o potted plants! I love it!!
Good luck and HAVE FUN!
Blessings!
D.