1. Don't use public proxies they suck. Use private proxies, 10 would be enough for starters

2.I don't know why you would want to answer each captcha yourself, use at least http://deathbycaptcha.com/. Consider investing in DC if you want to use SER at an optimal level.

3.GSA SER can scrape on it's own using the keyword list you give it.

4.Yes, Global Lists. You will have to manually remove dups(look up SER TOOL in search)

5.Not sure, probably not.

6.Not sure what you mean.

7.You need to configure SER to save submitted,verrified,failed. You can save theme anywhere you want.