The barista certification process can vary depending on the institution, but in most cases they will require that you complete a provided course in order to obtain the certification. Courses usually include exams and final projects, so be prepared to put your skills to use right away!
Certified coffee baristas are expected to know everything from how to properly operate the complicated machinery that pour espresso shots, to how many grams of ground coffee should be brewed per water extraction cycle.
To start out, there are several courses available online or in-person for coffee experts who would like to take care of their local area. There is also a professional organization where you can find certified baristas from across the country who have been through this exact same rigorous process - these people can help answer any questions ahead of time and get you ready for the program.