Invitations.. invitation station/how to stuff envelopes

Hi! So my fiance and I aren't sure exactly how to stuff our envelopes and we wanted to swing by the place where we bought them, Invitation Station in Deer Park. My fiance has been trying to call for 2 days now and the phone just keeps ringing. In case we CAN'T get through to Cathy to see if we can drop by on Saturday, does anyone know how to stuff the envelope?

We have:

the invitation
reponse card & envelope (does the card go in the little envelope?)
hotel & venue directions
a piece of tissue paper for each envelope

Does anyone know the correct order? Does the piece of tissue paper go in the front?

TIA!