Blog links

Quick questions, what’s the best strategy fot one way links from blogs?
My concept is the following, can you tell me if this is the correct way to go forward?
1. Create initially 2 unique articles
2. Submit each to 20 different blog services eg. wordpress, squidoo, etc…
3. Every month repeat steps 1 and 2.

So here I would have 40 one way links from 20 different ip’s, correct?

Question1
Would this be of any advantage in terms of pagerank and search position?

Question 2
What’s a good article for blogs? How many paragraphs , keyword density, etc? Does the 8% still apply like in websites?

Have a good weekend guys, and thanks in advance.

Pedro