This might sound obvious, but make sure they have a computer. Only in one job have I have had a computer on the first day, two of which I wouldn't call it computer because it might have been a machine but had no OS and/or email, and that's in 7 positions (companies/departments) over 20 years including (because of?) government and F500s, in one case it took 2 weeks and that was an internal transfer, no checks needed. Preferably with the OS and overall environment that you and they are OK with.