To get ranking number 1 of a brand new website in google How many minimum links,article submission ,press releases etc. required and hw much time will it take to reach at first page or at first position in google?
depends on your niche and how much competition, it can take anything from 4 weeks to 12 months, check out my article in this section on how I got a new website on first page of Google quickly.
How many searches does your keyword have and what is the competition (number of pages listed in google when you search) ? Tell us more and we might be able to help.
Build up backlinks in a natural fashion - a few directories, a few articles, a few sb, some nofollow mixed in, some mix of anchor text etc etc - then gradually increase number of links. That way you reduce the risk of your backlinks being dismissed as spam.