After a bill is passed, the enforcing state agency is in charge of creating rules to enforce the new law. The agency will draft the rules and then have a public comment period and possibly a public hearing before passing them. Proposed rules are often published on the agency website with deadlines for comments and sometimes a public hearing date.
Unlike the state legislature that only meets during specified sessions, state agencies can meet all year long. During this time, state agencies can constantly modify their rules and create new rules for consideration to the extent that they are allowed by law. For instance, if the law gives them the authority to regulate a specific list of animals with no option for the agency to add new ones, then they can only create rules for those specific animals. If a law gives them authority to add new species, you must continually monitor for proposed rule changes to add other species.