Keep an eye on the Idaho Soccer Refs for clinincs. 

Grade 08 is an entry level referee. You do not need to be in the 8th grade to attend. There has been confusion about this in the past.
There will be six steps that must be completed to become a US Soccer Federation Referee in Idaho.

1. Register for an Arbiter account.
2. Pay the 2018 ISRC Clinic fee ($30).
3. Pay the US Soccer Registration fee ($40).
4. Sign up for an in-person clinic.
5. Complete the online modules at US Soccer. These must be completed prior to the in-person clinic. Directions on how to prove completion are below.
6. Successfully complete the in-person clinic.