Welcome Musashib.
I'll try to offer some suggestions.
The first is that you enjoy some fun dives. One of the things that makes a DM unique in my opinion is their experience and comfort in different diving environments. It would be nice to do some tropical dives, cold water dives, deep dives, quarry/lake dives, great viz diving, poor viz diving, Nitrox diving, reef diving, etc. While this is not mandatory, it gives you a larger pool of knowledge to draw upon when helping to train other students (since that was your motivation). Leadership divers (Instructors, AI/DM/Dive Con) who do not dive for fun have a tendency to burn out. It can be stressful to "always be on" when you're in the water instead of just enjoying diving for diving sake.
The second suggestion depends on your current certification level and training agency of interest. If you have not done so, most agencies require Rescue Diver and/or Master Scuba Diver as well as CPR/First Aid to be completed in order to enter into a DM program. I am sure representatives from agencies that do not will chime in soon. Make sure that you have the prereqs to enter into a DM program. The agency you choose will have certain criteria that you have to meet regarding age, number of dives, types of dives, etc. If you were trained by one agency and wish to be a DM in another, there may yet be more things you will have to do before you can enter their DM program. Contact a representative who belongs to the agency you are interested in and educate yourself about what it takes to be a part of their system. I would also interview Instructors the same way an OW student would. Ask questions about what they expect of you. Any outside projects they may include. How they would would want you to interact with students. Previous DM candidates they have trained. Consider what you wish to do as a DM and see if their training will prepare you to accomplish that.
Lastly (as I'll let others weigh in on their suggestions), I would consider what you wish to accomplish as a DM. It may look "glamorus" to the non professional diver, but to those on the other side of the fence, we know that it can be a LOT or work. Lugging gear around, becoming an equipment tech, baby sitting divers, always being aware that a student can and will do something unexpected, being the last one to leave the dive site, being responsible for certified divers if you choose to lead them, mentoring for months under a challenging Instructor, etc. Not everyone is cut out to be a DM. It doesn't always boil down to their skill level or ability, but to their mental approach to diving and being a dive professional. It takes a unique person to enter into this side of the dive pool. Consider your options and reasons and decide wisely before you turn to the Dark Side!!
