To be ordained

[CyrilSebastian]

Does the man have to go to the seminary first before he gets to be ordained?

[CyrilSebastian]

Ordination in the Catholic Church is a sacramental ceremony in which a man becomes a deacon, priest,   
or bishop and enabled to minister in Christ's name and that of the Church.

[CyrilSebastian]

There are three ordinations in the Sacrament of Holy Orders: diaconate; priesthood; and episcopal.

[Benedict]

Does the man have to go to the seminary first before he gets to be ordained?

It is not technically necessary for the validity of the Sacrament for a man to go to seminary but it is part of formation which is part of the Church's endeavor to better form clergy in knowledge and understanding and demeanor before being empowered with the Sacrament of Holy Orders.