choosing a domain name for your content locked sites?

ok i am about to put together a few content locked sites that i plan to promote on CL, with scrapebox, and any other way i can think of to drive traffic. But i have a few questions that i hope you guys can help me with.

1. what methods do you use for choosing a good coverall type domain name? something that i can use to put many differnet wordpress blogs on example: generaldomain.com/how-to-train-your-cat or generaldomain.com/how-to-get-free-money. is the name even important? opinions please
2. would wordpress be the best platform for question number 1?
3. will blam and or adscend give me hell about having CL traffic sources (will be using non clickable image ads) to my content locked sites
4. how do you guys go about choosing a niche for your content locked site? newpappers, ebay top sellers, etc.

Thanks in advance for the help.