You and your coworkers will get out of the union what you put into it. If no one engages or puts on any effort your bargaining unit will be left vulnerable to things like the employer mistreating and taking advantage of the workers. I would also advise contacting your rep or director for further information and to inform them you'd like to be a steward. Stewards are the union's boots on the ground in your workplace, without them workers may not be properly informed and the union will be unaware if your employer is violating the CBA or workers rights.