Hello Parneis, and welcome to Argent Dawn!
You can find some links for getting started in Acrona’s Argent Dawn Roleplay Compendium: Argent Dawn Roleplay Compendium
In particular, Argent Archives https://www.argentarchives.org/ contains links to upcoming events and recruiting guilds.
As for factions, Alliance RP has open hubs (Stormwind is the largest, also Stromgarde and Darkshire) while Horde RP is more guild-based. There are also regular neutral events at set locations; for example, tonight is the Quel’Thalas market event https://www.argentarchives.org/node/285592 in new Silvermoon, which might be useful for forging connections if it makes sense for your character to be there IC. Seeing how your character is a blood elf, you might want to also join one or more of the Quel’Thalas Discord communities.
An up-to-date index of Discord communities is here: Argent Dawn Discord RP Community Index