Tumblr linking ratio question

Hi Guys,

I've 3 ier page in my site & my keywords are between 20 to 40.

I want to send 10 web 2.0 to all 3 pages,but I want to ask how many expired tumblr link should I send?

5,10,20,30? What kind of keywords shuold I use exact,long tail,partial match,URL,Brand?

My aim is to bring all the Keywords to pages 2nd with web 2.0 and expired tumblr blog then I can hit the PBN links.

Also can I just post on tumblr with a picture and hyperlink in description of that picture,since tumblr is a photo share website.

Edit : I want to ask also,do you send direct GSA links to your web 2.0 properties in order to boost and index them?

Thanks