dumb invite quesiton

I have no clue...

Who prints the names and addresses on all the envelopes (inside & outside)? The people I buy the invites from or a seperate printer??

You can hire a caligrapher or an outside company to do it, or you can do it yourself.

My FIL is retired and we had were sending out 250 invitations (alot of work!) and we were moving at that time, and he did them on his computer. They came out awesome!