Help ID bugs & disease

How do I ID bugs? I should know this by now but I don't. Skip to the bottom for pictures;
We're in zone 6, purchased Eva Purple Ball Tomatoes, Manyel Tomatoes (heirloom) from a Southern Seed Exposure in Virginia. 2nd year gardening.
The first of the four grew out of whatever their problem is; it is currently growing and will be running late this summer if it continues, but may still put out a tomato or two. The three other plants did not make it and were just replaced with regular red tomato plants from the store, which look healthy as well.
The problem is seen in the pictures below--they would keep growing new sprouts as the older leaves began to curl and dry up. The plant wouldn't turn brown, just get crumbly. It looked like the new sprouts were killing the old sprouts. Eventually the older plant had many of the leafs at the bottom turn brown, but only on the edges. Some of the plants had what looked like bugs & either eggs or droppings, but I'm not sure.
Other plants in the garden are fine, except just yesterday I found bugs in my pole beans: please see the pictures below.
I don't know what happened to the tomatoes, any advice on what it could have been will be appreciated in case it happens again. Any help on where to begin learning how to ID bugs, as well as what bugs I currently have will also receive many thanks.
you can see all the pictures at once at
curled damage -
tomato bugs -
smallest plant -
two (three kind of) out of four tplants -
pole bean bug -
thanks for reading
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