There are quite a few curricula available for teaching signs in special education. In my classroom, I have both Edmark Signs Around You and Pro Ed's Survival Signs. Edmark teaches 100 words total and Survival Signs teaches 80 words total (40 indoor/40 outdoor).
I also have designed my own curriculum called "Reading in Real Life" and I have a signs edition. You can read more about it here. I generally run a functional skills class period, which includes sign instruction, with each of my students. I have created the Reading in Real Life word list of signs that my students should know now (in middle school). I have this list split into 4 sections- warning & safety signs, indoor & lobby signs, community signs, and directional signs. Each section has 25 signs and I introduce up to 5 words at a time, depending on the student.
I also have designed my own curriculum called "Reading in Real Life" and I have a signs edition. You can read more about it here. I generally run a functional skills class period, which includes sign instruction, with each of my students. I have created the Reading in Real Life word list of signs that my students should know now (in middle school). I have this list split into 4 sections- warning & safety signs, indoor & lobby signs, community signs, and directional signs. Each section has 25 signs and I introduce up to 5 words at a time, depending on the student.
Regardless of what program you use, there's 3 components to include when teaching environmental signs.