lakerslive

What basic conditions should I look for when buying expired domain name

I can pump out good content, but i would like to start receiving SE traffic soon about 1-2 weeks time and not wait 3 months and avoid google sandbox..

So,

should i buy domains with
1. Alexa rank? even in the millions?
2. some backlinks?
3. Age of domain? (must be over 3 months old?)
4. Active domain?

Pls point me to the right conditions to help me make it happen. Thanks