The format for the Sunday meeting is usually a 30 minute public talk. This is followed by a Watchtower study which is a tightly controlled format where a paragraph from the Watchtower is read , the conductor asks a few scripted and auxiliary questions and answers are given , ideally as near to word for word from the paragraph as possible. Generally it is quite dumbed down and ( frankly ) quite boring.
The organisation has some unusual beliefs (including their core teaching that "imminently" ( as they have been proclaiming since 1874! ) God will destroy 99.9% of the earths population at Armageddon and only the faithful ( ie JWs ) will survive.
Essentially however it is not dissimilar to other similar groups ( such as the Mormons) in that it is a kind of self-sustaining business model that has millions of volunteers being told they are doing "God's will" by basically being unpaid volunteers distributing the Societies literature , developing the Societies real estate operation and generally keep them busy in "Jehovah's service". If you think of a typical MLM model where people are told they are changing the world but in reality selling overpriced and often useless "herbal" products or "green" cleaning fluids to the enrichment of a few people at the top - it's a bit like that with a religious element ( without the obvious enrichment of the leaders. )
Most JWs are nice people , though it does seem to attract quite a few weirdos and a few a**holes. Be wary of the "love bombing".
Let us know how you get on. Enjoy....