Credit scores issued by the most popular credit-scoring models in the U.S. begin at 300. However, this is unlikely to be your first credit score unless you are irresponsible with your finances. You typically start building credit after you get your first credit product, be it a credit card or a student loan.
Making your payments on time is one way to build your credit score. Depending on how well you utilize your credit, your credit score may get to anywhere from 500 to 700 within the first six months. Going forward, getting to an excellent credit score of over 800 generally takes years since the average age of credit factors into your score.