what is the best way to get pr for a new blog?

Start building links in blogs and forums. Try to do 10 to 20 links per day and as the site matures your pagerank will increase.

Keep a daily target of building links. For example month 1 - 30 links month 2 -50 links and so on. Try to get good links and in 1-2 PR updates you should get a good PR.

Build dofollow backlinks from other sites - directories, blogs, forums, etc. More of these backlinks should definitely help you in PR building.

Improve also on your content. Relevant, unique and useful content will pave way for organic linking once other sites sees the value in your site and decide to link to you. Such backlinks are most favored in SEO as well.

PR depends on the quality of inbound links, choose quality link partners, minimizing reciprocal linking and prioritizing One-way links.

keep building back links as much as possible till the next pr update.

Just see,no speaking!

Post regularly at the very least once or twice per week preferably more.

Join a few blog related forums and make good use of your signature there.

A handful of article submissions (original content) will not do any harm either.

Submit to a few of the leading blog directories.

Make quality back links having high pr for your blog from various relevant websites.

Bid directories are also a good way to get quality back links as long as they are edited for quality and depends on your marketing budget.