Les see if I can remember.
Must be a 35 year old male
If Married, you can not marry again if your wife dies.
You’ll need to check with the dioceses. Generally, they have an office of the Permanent Diaconate.
In my dioceses, you must now have a college education.
You and your spouse(if married), must go through 3 interviews as a couple. One is by the vocation director, the second is by an assigned priest in the Dioceses and the third is in your home, by a team of deacons and their wives.
If accepted into discernment, you and your wife will attend two classes per week, for 12 weeks. These classes consist of Church history on the diaconate and discernment. They also have ordained deacons and their wives come in and talk to the class and answer questions. There is also some psychological screening that you and your wife go through. In addition to the 12 weeks, you must attend a Sunday workshop, once per month.
After 12 weeks, if you are accepted and desire to continue into formation, its 5 years of classes in theology, liturgy and history, two nights per week during the fall and winter. In the summer there is a slight break, but the final year, your assigned to a parish as an acolyte.
In all, its grueling, but even if you go through just the discernment period, its a win-win situation, even if you decide like I did, that the diaconate was not your call.
Bottom line, check with your diocesan vocation directors office.