Advice needed please

Hi, I have been using some cheaper COC style grippers for a few months now. I progressed to using the 2.5 equivalent for a few reps. I want to start acually trying to train my grip instead of just messing around with my grippers when I want. Where do I start? What other equipment is useful? Any advice will be appreciated. I am very new to this form of training but im really enjoying it so far.