What you think is best way to promote a newly built website without getting punished by google also best way to be in 1st page for relevant keyword?

Google punihes your Website for the following reasons:

Copied Content writing

Using Black Hat Techniques

Unwanted Backling process

1st page ranking does not have any time frame, it is refreshed and craweld by robot and during crawling above mentioned factors are seriously monitored and also relevant keywords, content quality, bouce rate, daily page views per visitor, daily time on site, how fast your website is downloaded or uploaded is measured.  So there are a few websites which if you plan to make on Wordpress might decrease your page ranking as well because if your up or dowloading time is higher than your competitor then does not matter how much money you spent but will take prity longer time to come on first page because your user would never prefer any slow running website does not matter how nicely it has been constructed.