At my previous startup which was a home scrap pickup service in India, we acquired our first few hundred users with word of mouth, offline event participation (in an exhibition) and getting an article in a local newspaper.

The exact path to getting the users will differ based on what you're attempting to do. In an awesome HN comment for business advice (a few days ago) I came across this awesome book called Traction; which is like a cookbook for user acquisition. I'm reading the book right now and it should give you a lot of ideas!