Welcome.
Although it all sounds pretty simple it's not like you all know. I grew up being a JW and my whole family are still in. They are not very open minded and I'm not sure how to tell them I no longer believe the organization is Jehovahs' spirit anointed organization but I guess we all learn how to deal with it over time.
You don't owe anyone an explanation about anything. If pressured about why you're not participating in the dog and pony show anymore just say that you're working on some things right now and they're personal.