1) how much articles i need to post on my website? how frequently?

2) How much articles in need to put on goarticles/enzine and put backlink there pointing to my website? How much frequency? i mean how much per week or per month.

3) What is the acceptable length of the SEO article and how much keyword density?

4) Also putting to many backlinks on website A to website B on same page of Website A to Same other page on Website B is acceptable?Is it considered as spamming?

5) Putting to many backlinks on website A to website B on same page of Website A to different pages on Website B is acceptable?