See the Passover Kit and Spring Feast Collection, Counting the Omer charts & Free stuff at https://store.torahsisters.com/collections/spring-feasts

Get the Hebrew calendars that tell you which days the feasts and the omer count is on at https://store.torahsisters.com/products/torah-keeper-planning-kit

Get Anne's Feast workbook at https://anneelliott.com/2016/03/the-biblical-feasts/
See other resources at https://torahsisters.com/new-to-torah/
Lots more at https://landofhoneyblog.blogspot.com/
https://www.torahfamilyliving.com/
https://torahfamily.org/
Book about why Christians should do these things at https://www.thewaydoc.com/collections/the-truth-reformation-2-0