I assume, there'sthink there will be a lot to discuss.

The phrase you used isn't wrong, but it sounds a little awkward.

2) I saw him out of the corner of my eye whenas I was driving past his house.

3) My colleague's ideas usually confront mineI sometimes disagree with my colleague's ideas, but we're good friends nevertheless.

Not sure what original phrase "ideas usually confront mine" was trying to convey, but if it is simple disagreement then this would be a better way to say it.

4) Her explanations were usually pretty confoundusing, so I finally stopped taking her classes.

"Confounding" can be used here but confusing sounds better in this context.

5) Banksy is a very prolific artist, and it seems he has fruitfully spent been hard at work this summertime in eastern England.

Your sentence works, but this is another way to say it that is pretty colloquial.

Do you think there could behave been a better solution?

Since the withdrawal is complete, it is in the past.

7) My cousin is all aboutobsessed with dancing.

I'm assuming you're trying to say that your cousin is very interested in dancing, loves dancing, etc, in which case you could say "obsessed with".

Even if you waoke her up at night and immediately asked her about it, she willould comfortably sit in herup in bed and begin to tell you what she thinks dancing is.

I think the sentence sounds better in past/conditional tense, because it's describing a hypothetical. The phrase "what she thinks dancing is" is a little confusing though, do you mean to say "what dancing means to her"?

8) My friend is always ready to help me out with any of my issues, but what he usually demonstrates doing this is "you getthe only thing he usually accomplishes when helping me is getting on my nerves".

Doesn't it remind you about that one story written by O'Henry - the story about the best friendship ever?

9) I successfully quit smoking many years ago and can say that the bottom lisaving money is a great motivationor.

Assuming you meant "the bottom line" as in money. But it is not common to use "the bottom line" in this kind of context.

Ask yourself what can motivates you to stop smoking.