Hi
I'm really not into this whole thing about planting seedlings out whilst still in their loo-roll pots, if the soil gets at all dry the card tends to become pretty well inpenetrable, and root growth is likely to be restricted....and confined within a loo roll I am sure life would soon get pretty difficult! I'd advise growing them in small pots or cells and then planting them out in the usual way......and yes, it is not uncommon to have to tie young beans in initially. Until their growth comes into contact with the support they cannot twine around it as the relevant growth response is not initiated.
PG