A few questions about some garden plants?

We are renting a house on some land and I found what I think are some green bean bushes they are big and they are growing little pods and have little yellow flowers. How do I know when to harvest them? Also there are raspberry plants. Do I need need to put some support behind them they are huge. When will they be ready to harvest? They have pink flowers all over them. And I planted a vegetable garden and ants have been eating the little bell peppers that grow. What can I do to prevent it? Thanks for the help!!!!
 
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