1. I registered a new domain with keywords in its name and promoted it a bit. A week ago bought an old expired domain with many backlinks and some authority but broad name without my desired keywords. What should i do next for better rankings, move my site to old domain or i can benefit from both domain names (how could i do it? 302 redirect just dropped my rankings!) 2. How many additional domains i can have to leech their ranking and squeeze it to my main site if it is a whitehat method? 3. How often does google update its rankings in search output? I've noticed that my old indexed page dances in rankings without changing its description in google, while i change things on host (like: i've changed page title - page advanced to 3 positions in a few minutes, but google still displays an old page text in output). Therefore, can i optimize things until i get at top10-20 or i need to wait before i make any further page title\kw\text updates (for how long)? 4. If i have a ccTLD domain would i have any benefits if i register the same domain name in .com\.net\.org zone?
Guys, i would really appreciate any help because i am already tearing my hair out with all this seo... thanks in advance.
Create unique and useful original content on something you are knowledgeable in.
How many additional domains i can have to leech their ranking
As many as you want but the leech effect will dry up quickly, if it doesn't get you banned from search first.
Therefore, can i optimize things until i get at top10-20 or i need to wait before i make any further page title\kw\text updates (for how long)?
Top 10-20 will drive little traffic, top 1-5 are the only positions guaranteed to be above the fold on page 1. You can optimize pages to some degree but optimizing pages alone can only improve rankings so much. You'll need a solid internal link structure as well as incoming links from trustworthy places. When you make changes wait a couple of weeks to see if anything changes in Google, a couple of months in Bing and six+ months in Yahoo!
re: #4, the benefit to owning your domain name in .com/.org/.net etc is in brand recognition and so that nobody can copy your site and outrank you with your own domain name. If you own the .com version it's less of a problem, if you own just the .net for example I'd grab the others and make an offer for the .com.
2JS_Harris, your answer was really valuable to me. Therefore i will just support the site and add some unique content from time to time and if it wont advance to the first G page in 3 months then i will just sell it or drop it. Thanks.