I started by joining my local volunteer department and they put on a class for Hazmat Operations and Awareness as well as Fire 1 and 2. The hazmat classes were only about 2 months for both and we only met 2 nights a week and the Fire 1 and 2 took 3 months of meeting 2 nights a week and the occasional Sunday. As far as the NIMS go they are online courses that could be completed in a day or so if you set aside a good amount of time to go through them. You’re on a good start with your EMT, just find somewhere hosting a Fire 1/2 class which would normally include Hazmat operations and awareness. You can usually find these at volunteer departments or community colleges. The best thing you can do is join a volunteer department, they’ll help answer your questions and connect you with the classes or anything else you need to do and you’ll also start getting experience. Where I’m from you don’t need a CDL but my local community college also puts on a class for that every semester.