Personally Tammy I think the beginning of school is an incredibly busy and stressful time, so I would not recommend the beginning of school to do anything except maybe survey the crowd to glean if there is interest, prior knowledge, etc. Also, I think snagging a tech savvy person or two to do more intimate 1:1 or 1:2 hands on training is more powerful and effective than passing along all the paper or how-to's (these folks can then hopefully share out some of the information to their peers/teams/specialty groups). Finally, I think an underutilized awesome resource are paraprofessionals/classroom assistants. These folks often have more flexible time and ability to take notes/learn how to navigate and then they can sort of "spoon feed" the info and knowledge to the busy teacher as they see fit.
Good luck in the fall!