IT Classes

With the aid of a grant I am going to provide IT classes in our village hall, there will be up to 12 laptops using a wireless connection, what if any problems am I likely to encounter
I am also considering using wireless printers for the class, again, are there any pitfalls I should be looking for
Last but by no means least, memory stick usage, there is, I imagine a distinct possibility of infecting every computer in the district. I have considered restricting memory stick usage, having a dedicated machine with decent antivirus malware software installed. And using it as a sort of sheep dip. I would welcome any and all suggestions. :confused