When you start SEO, it is going to take a little bit of time for results to come, think around three to six months for you to start seeing your traffic number shoot up. Once you get to the six to nine-month mark you will see significant growth in traffic and leads that help to build your business.
PPC on the other hand will get you visibility right away, however, once you decide not to use these services, the results will no longer be there like they would with SEO.