Guest posting: search, negotiations, accommodation

Placement of guest posts with links to the online store of audio equipment.
Stages of work:
1 . He analyzed the links of competitors, among which he distinguished the articles (other quality sites from the list were also suitable - for the placement of other types of links).
The 2nd He has collected a list of other quality thematic sites for possible gest-posts.
3 . I made a mail to the address from the first and second points.
and 4. Published articles with reference.