contact your diocesan vocations office
the diaconate formation has to be the one approved by the diocese in which you will work
you may be able to work on pre-requisites (undergrad degree or whatever they are) on your own schedule but you will have to conform to whatever program they have.
the diaconate is an intensive commitment, and the formation reflects that reality.
If you have other priorities in your life right now, the diaconate is probably not for you at this time, but you should get personal guidance from a spiritual director in that discernment. Bear in mind that if ordained you will have at least a part-time “job” somewhere in the diocese, with or without pay, usually at least a stipend, that may be at least as demanding as your day job.
You must also have a recommendation from your pastor, and have the understanding that you may not work in your own parish, but where the bishop assigns you. Your wife must also go through an orientation so she can give her full free informed consent. If you are not yet married, you may not marry after your deacon ordination.
In this diocese the formation program has just started up again after a 10 yr hiatus, and I believe candidates are expected to already have the degree or whatever prerequisites there are. the actual 3 yr formation classes (3 nights a week, I think, with some weekend gatherings) does cost something but in the case of real need the parish or diocese probably helps with that in some way.