When you first enter the game with you new character, just follow the tutorial. You will be lead through a dungeon to learn the basics of the game.
Intro Tutorial Video:
When you exit you will be on Korthos, this area should be skipped unless you are playing on a f2p account as the quests in Stormreach offers better experience. Talk to Valeria Sinderwind on the docs to leave Korthos.
In Stormreach proceed up the stairs from the docks and find Groodug Meathands next to the Auctioneer and the mailboxes. Purchase a level 1 hireling, any class will do at this point but i always prefer the Cleric. If you don’t have enough money, just skip this step and come back when you do.