If you take this links in same period you can ban from google for temporarily ( sandbox ) and only you can get PR 3 value for your site.
Try to get some good links.. you will automatically get PR. Hope article submission will help a lot in this regards. thanks w.s
You knew that you had a PR4 link, but you did say that you had zero links, are you trying to be a smart ass or what ? You will not get banned because of getting many PR3 links. The sandbox is not a ban. Why don`t you show us some PR3 domains you have that has no links ?
Get as many backlinks as you can, for example my website is 2 months old and it jumped from 0 to 4. one of my friends with pr6 gave me a link. so high pr is important too...
just make threads on DP about topics that have been covered a million times and you'll get an automatic PR6 on the next update
Try getting backlinks, and get it submitted to Google and other search engines. It's technically hard to get link exchanges with PR sites though since they usually look for sites with PR already... if you can get those sites with strong PR then you're basically on the right track.