wording help

So hopefully FH & I are going to get invites ordered this afternoon, but we're going to be putting a note in with some of them to invite some family members to arrive early for photos. So I'm looking for 2 things right now...

1. Should I have the printer do them or hand write them (there will probably be about 15-20 to do)?

2. How should I word the request? I'm drawing a complete blank right now

TIA!!!