Lots of catch-all stuff. First, who ordains:
3. The liturgical rites by which admission of candidates for the diaconate and the priesthood takes place and the above-mentioned ministries are conferred should be performed by the ordinary of the aspirant (the bishop and, in clerical institutes of perfection, the major superior).
How the intervals between ministries are to be handled:
4. The intervals established by the Holy See or by the episcopal conferences between the conferring–during the course of theological studies–of the ministry of lector and that of acolyte, and between the ministry of acolyte and the order of deacon must be observed.
Candidates are to sign a declaration:
5. Before ordination candidates for the diaconate shall give to the ordinary (the bishop and, in clerical institutes of perfection, the major superior) a declaration made out and signed in their own hand, by which they testify that they are about to receive the sacred order freely and of their own accord.
The celibacy connection:
6. The special consecration of celibacy observed for the sake of the kingdom of heaven and its obligation for canddates to the priesthood and for unmarried candidates to the diaconate are indeed linked with the diaconate. The public commitment to holy celibacy before God and the Church is to be celebrated in a particular rite, even by religious, and it is to precede ordination to the diaconate. Celibacy taken on in this way is a diriment impediment to entering marriage In accordance with the traditional discipline of the church, a married deacon who has lost his wife cannot enter a new marriage. (Sacrum Diaconatus Ordinem 16)
Formation comes under the watch of bishops, but with input from the curia:
7. (a) Deacons called to the priesthood are not to be ordained until they have completed the course of studies prescribed by the norms of the Apostolic See.
(b) In regard to the course of theological studies to precede the ordination of permanent deacons, the episcopal conferences, with attention to the local situation, will issue the proper norms and submit them for the approval of the Sacred Congregation for Catholic Education.