Can you write an answer for all three your questions? Thanks in advance
Sure.
1. Quick Flip - I generally focus on two word .com's with the occasional 1 word .net. I look for quality search volume, aged, high ad competition and use the radio spelling test. (If I told you over the radio, would you immediately know how to spell it?). Those are the basics, then I look for other indicators - like: comparable sales and business application. I'll use one of my sales from the past as an example:
InpatientDetox.com
Low search volume - but - huge business application, lead generating and a big business in substance recovery and addiction. Great relative search volumes which it can rank for.
$4.56 CPC
High Ad Competition
Easy to remember/radio test.
Brandable.
I picked this domain up for $162. I sold it for $800 within 30 days.
Another one I bought was FlooringOptions.com - Tell me why you think thats a quick flip?
2. Long term hold. This is where you need to focus on premium keyword .com's. One word and very aged are your best bet here. Focus on ultra generic terms than can brand just about any type of company. Although, the future will be more tech based, so those domains will be good holds as well.
3. Development - I look for one word products like Keyboards.net, ReggaeSongs.com and other domains that not only have products attached to them, but something to blog about daily. Technology terms that include products like GamingHeadsets.com would be fantastic for development. High search, product attachment and endless ability to write content (for seo purposes).
I know this is a rather broad reply, however, the basic foundation of my strategy in investing is in it. It would take me a novel to tell you my day to day going about's, but this should hopefully point you in the right direction.