I am new at this game. Just started this week. I just finished building my 10th stations. I was caught off guard when I had to delete a stations so that I buy a Battalion chief, Heavy Rescue, Mobile Air and a Water Tender. My next step is building a 11th Station. Do I need to buy a HazMat? Once I buy it, do I need to "train" the staff? or will it be ready to respond once I buy it?