Hi, first of all your constraints:
what are you growing onto - can it grip, can it wind itself on or can it be supported;
What are you growing it in - soil type, water, etc;
Which direction does it face and what is the overall microclimate - north/south/east/west - full sun, semi, shaded?
What about your reasons: what are you growing it for - looks? wildlife? noise pollution? Windbreak? Do you want flowers? Do you want year-round cover?
Now you have some idea this will limit what you put up there so the next step is to get a good book of climbers. The RHS Practicals: Climbing Plants is good, here's one list http://www.gardeningdata.co.uk/climbers/climber_plants.php and What to Plant Where is also well worth a look.
You can then install some bird boxes, feeders, ladybird boxes, and bat boxes (all depending on finance and height constraints of course!).