@James McGovern first make sure none of the tenants are in a lease. If they are but have missed rent then you can move to a notice to quit and start the formal proceedings. You will need an attorney for this. It shouldn't cost more than 1500-2500. There are plenty of attorneys out there that can assist, if you need a recommendation please let me know (I invest near you in Bloomfield, CT).
@Michael Doherty I have done my own evictions successfully multiple times. I have received coaching on how to be successful by a work from home attorney mom