What are the requirements needed for adult immunizations?

Many adult vaccines. Hepb vacc for adults who may come in contact with blood or injection needles, or have others risks. Hepa vacc for adults who travel abroad, or have other risks. Hpv vacc for adults who are young women, or have other risks. Tdap vacc for adults who have contact with children, or are due for a tetanus booster. Annual flu vacc is recommended. Other vaccines include shingles, pneumonia, typhoid, etc..
Adult vaccinations. If you haven't had ANY vaccinations, the list is extensive. You can get a full immunization schedule at http://www.cdc.gov/vaccines/schedules/downloads/adult/adult-schedule-easy-read.pdf.