Question abouts Peas & Beans

Hi all, I am going to grow peas and beans for the first time, and wondered if anyone could help answer a few questions for me (probably stupid questions). 

-  I will be sowing them in a raised bed about 2.5m x 1.2m.  I Was thinking of making two long rows, and sowing peas in the first half of each row and then long beans in the other half of the rows.  Is this the best way?

- Can the climbing structure be the same all along the bed for both peas and beans - I was going to use bamboo canes (pyramid shape) all along the bed, but then heard that peas wont grip onto bamboo, is that correct? (Already bought the bamboo!)

- Would I build the structure only once the peas and beans have germinated?  Because I was thing of initially covering the bed with netting to stop birds from taking the seeds, then later removing the netting and building the structure.

- Do the bamboo poles have to be inserted at every interval where peas or sown or can it be less accurate than that?

- Will about 6 foot canes be ok for both peas and beans?

Thanks a lot.

That's very helpful, thankyou.

As it happens, Ive checked the peas I bought and actually they will only grow about two feet, so I will just use some long twigs or single pieces of short bamboo I guess.

I wonder what the best set-up would be for growing both these short peas and also climbing beans in the same bed?  Perhaps just two rows for half the length of the bed for the peas, using short pieces of bamboo along the rows, and then climbing beans in two rows for the second half of the bed, using long pieces of cane to make triangles, tied at the top.