Document, PPT or PDF sharing. Which submission we do first?

Hi expert's I wanted to know if I can do only one submission on Document sharing, PPT sharing or PDF sharing then which submission should I choose to do.

Directory(Document Submission )

I think you should start with PDF

All submissions are equally important to build your website ranking and also traffic. They are all off page techniques that are helpful to build do follow backlinks and rank keywords higher in search engines.

All submissions are equally important to build your website ranking.

All submissions are equally important to build your website ranking and also traffic. They are all off page techniques that are helpful to build do follow backlinks and rank keywords higher in search engines.

Thanks you experts. for giving such a useful answer. and solving my problem. Now my vision are clear that which one should I choose... Thanks a lot again to all.