I'm trying to rank for a particular keyword in the serps & I'm
going to use document sharing Sites like docstoc.

When I create a pdf document whats the best keyword density
and do I need to make the keyword phrase hyperlinks, put quotes
around it or just leave it like a regular phrase in the pdf.

You should go over to Adobe.com and read up on there PDF help section so that you can learn how to do everything you need to do. As far as the keyword density, you want between 2-4% for the most part. You don't need to put quotes around it or anything it's not necessary, but you can if you want to.

Originally Posted by meakerseeker

I'm trying to rank for a particular keyword in the serps & I'm
going to use document sharing Sites like docstoc.

When I create a pdf document whats the best keyword density
and do I need to make the keyword phrase hyperlinks, put quotes
around it or just leave it like a regular phrase in the pdf.

I'd suggest you do something useful instead!!