If they are clueless, it may be wonderful for you to help guide them. But please always remain aware that schools operate in the context of a school district that may have certain standards with which individual schools must comply. The most important part of your participation is making sure the school is benefitting from your efforts. If you have strong preferences for particular techniques, systems, or manufacturers, and school staff seems unresponsive, it may be helpful to take the issue to district-level staff for their consideration. If this proves fruitless, and you don't want to jeopardize your relationship with the school, compromise is called for.
Schools are often inherently ambivalent about volunteers from outside their own parent community.
They need help in many ways, but they are also responsible for the welfare of their students. People coming in from the outside are relatively unknown, and the potential problems that could arise might keep a school from welcoming you with completely open arms. They also may be unprepared for technology help. This is obviously truest when you approach a school that has not actively advertised its needs on our site. But the Good News is . . .