is there any ready list of do follow blogs or sites providing open comments or guest/article posting?

Well you need to have a goof research. Sites with dofollow links are hard to find and even you find one it is hard to get a link on it. I suggest that you focus on searching for a relevant niche site instead.

you have to find out which websites are giving do follow links. after that you have to get backlinks from then that sit. for example directory submission mainly sites are giving do follow link.

Step 1: Go to Indulgy and register a New Account on the website.
Step 2: Now add photos from your Blog and then your website will get a Dofollow Backlink by the URL it fetch from the photos.

Dofollow link will create link juice for your website

Now add photos from your Blog and then your website will get a Dofollow Backlink by the URL it fetch from the photos.

to get backlinks you do following things
1.do follow bookmarking sites
2.classifieds
3.forums
4.directory
5.search engine