For bible readings we use the lectionary mostly, as it allows us to cover the whole bible over three years.
The Uniting Church in Australia has many resources freely available on the national Assembly website, including the Liturgy Commission and NCYC pages, and on Presbytery and various task group web and Facebook pages.
We recommend resources from MediaCom in South Australia, including the Seasons of the Spirit curriculum for the kids, the Words for Worship yearly prayers, music and liturgy suggestions and the Pulpit Resources preaching material, plus many commentaries and other helpful books.