I dont think so, I think one targeted key word is enough. You can put few similar keywords but dont repeat the same word 2-3 times. Its my opinion but I dont know if i am right or wrong?

1 day - If you ask 2000 people to visit your sit.
1-2 years - If you dont advertise your website.

So the more you advertise the more visitors you will get. Try to have like exchanges with...

I think its not true. It is based on many other things as well like the domain age, quality contents, out going links. And the back links must be from the relavant site. Like if you have a clothing...