Classical education for a child with no Latin background - where to start?

Start with Prima Latina or Latina Christiana. Both assume zero prior knowledge and the pace is gentle. Within a year you will feel confident.

The Well-Trained Mind by Susan Wise Bauer is your map. It explains the full classical approach from scratch.

We started classical at age 11 with no Latin. Three years in, our son reads Caesar.

Memory work first: grammar, timeline facts, geography pegs. The Latin follows once the pattern-recognition habit is built.