There are several ways to describe how someone becomes a Christ-follower. One simple way to remember is to:

Admit - that you sin and are a sinner who is separated from God and in need of his grace to forgive us and bring us into relationship with God (Romans 3:23).

Believe - that Jesus died for your sins and for all human creation. Believe that he demonstrates his own love toward us in that even while we were sinners, Christ died for us (Romans 5:8).

Confess - that you want Jesus to be the Lord of your life (Romans 10:9-10).

Another way to say it, a way that the gospels clearly show it, is to follow the call of Jesus Christ which means to love the Lord our God and to love our neighbors as ourselves.