Over the years CCP has only done small minor changes to Cosmos Agents and their missions. Doing a google search should list some newer more recent guides. Back when I ran Cosmos these are the guides I used. Even though these are old and pretty much discontinued, the info contained within is still close to being current:
Cosmos Agent locations and info - http://wiki.eve-inspiracy.com/index.php?title=COSMOS_constellation
Amarr Cosmos - http://wiki.eve-inspiracy.com/index.php?title=Amarr_Cosmos_(Guide)
Caldari Cosmos - go-dl.eve-files.com/media/1305/Cosmos-Missions-101.pdf
Gallente & Minmatar Cosmos - http://web.archive.org/web/20120426163113/http://eve-odessa.com/en/guides/cosmos.html
All Factions Cosmos - http://web.archive.org/web/20160226001044/http://www.hb3.info/cosmos/
These are other Event Agents who also give Faction standing increase:
All Factions Career Agent locations - http://wiki.eve-inspiracy.com/index.php?title=Career_Agents
All Factions Circle Agent locations - http://wiki.eve-inspiracy.com/index.php?title=Circle_agents
All Factions Data Center Agent locations - http://wiki.eve-inspiracy.com/index.php?title=Data_Centers
All Epic Arc Starting Agents location & info - http://web.archive.org/web/20160225225009/https://wiki.eveonline.com/en/wiki/Epic_mission_arcs
All Factions Epic Arc guides - https://eve-survival.org/wikka.php?wakka=MissionReportsEpicArc