Insects and yellow leaves

I think i may have an insect problem. I mean, i see plenty of insects in the garden - tons and tons of worms (just come on over if you ever need some bait for your fishing pole!) and rolly-pollys, and ants, and other types of insects . . . but i'm talking about the type that eat your plants. Why do i think this?

Exhibit 1:

Something is just chewing and having a heyday with my bell pepper plants. It's also kind of getting into the Mr. Stripey tomato plant.

And, speaking of Mr. Stripey, his bottom leaves are starting to get yellow:

This is alarming to me b/c I would have thought that Mr. Stripey would be producing some flowers by now. I am worried he does not get enough sun? Or too much water? Is it root rot? Does ANYONE KNOW what the problem is that is making these leaves turn yellow? I want to fix it as soon as possible b/c I am really looking forward to these 1 lb striped yellow and red tomatoes. I mean, I salivate just thinking about them. Just brushing by this plant fills the air with fragrance. We have not one single blossom on this plant, however.

So, questions of the day:
1) What insects are eating my bell pepper plants?
2) how can i find out and how can i get rid of them/prevent them?
3) why is Mr. Stripey turning yellow, and how can I change/prevent that?

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THANKS!