First, make sure you like it. Assuming you finish and get to work, you can get the lowest level DDE with a year of sea time. If you end up sailing deep drafts, three years to get a 3rd assistants ticket.
If you decide to stick with tugs or other various workboats, going up the DDE chain makes more sense and building from that. Everyone will recommend to set aside realistic goals, have patience, and don’t dick around procrastinating to upgrade when you have
the means.