do green beans needs to have something to cling on to grow?

What sort of beans are they? Does the seed packet not help? Climbing beans - runner or french - definitely need something to climb on.

Even If they are dwarf beans, it's a good idea to give them a few sticks, like peas. Most dwarf beans eventually produce some long flowering shoots and the sticks give them support. Otherwise a lot of the beans lie on the ground and the shoots fall over. Alternatively, if they are growing in a group. put canes around them with some string to keep them from flopping over.
Climbing French beans are always better value for money/space as although they take longer to start bearing, they produce far more beans over a long period. There are many fabulous varieties to choose from, but I'd recommend either Fortex, a really long thin bean, or Neckarkonigin, a good yielder that never goes stringy.

If they are runner beans and you're not sure how to build the cane support, I've just done a google images search on canes/runner/beans- if you do this you'll get some helpful photos and advice. If they are indeed the runner type.

the packet says they are tendersweet new and improved garden(green) bean(right off the packet) so i'm not sure if they are dwarfs or runners but I decided to run strings from the pot right overe each plant to the patio porch railing above it.