CCNA is not very useful for MikroTik, because Cisco is different. Get https://mikrotik.com/training/
full-time training and finally get at least MTCNA (https://mikrotik.com/training/about
). Few months with practice of MikroTik networking and you'll be fluent enough even without trainings and certificates, but training will be definitely faster and hassle-free. Last time I met certified MikroTik trainer in my area, he was an owner of a system integrator company, a very skilled person, so no doubts a good trainer can explain every single bit of MikroTik approach.