Don't sweat the broccoli- my mom never had any luck with it.

Any squash vine- pumpkin, zucchini, etc, will take over wherever you plant it. Each plant needs lots of room, like a three foot diameter between plants, in order to really succeed. Your pumpkins are looking for more room.

Dowel and twine trellises always worked well enough for my mom, but we never tried pole beans.

We've had our first meal of garden grown green beans, and it was nice.