For the save-the-date, use an A9 envelope. For the invitation and reception card, use A2 (get the envelope liner how-to and clip art). For the reception card, use 4 bar. (A9, 5 1/4 by 8 3/4 inch, ; A2, 4 3/8 by 5 1/4 inch; and 4 bar, 3 5/8 by 5 1/8 inch, all in superfine soft white, from Paper Source.
Edit the templates with your information, then print onto cover-stock paper. Cut between the crop marks with a craft knife and a metal ruler (do not cut all the way to the edges of the paper; this will leave the crop marks intact for subsequent cuts).
The names on the invitations and the reply-by date on the RSVP cards will have to be filled out by hand -- either write in the information yourself or send to a calligrapher.
For Noneditable Place Cards
Print each table number onto perforated and precreased place-card paper; flip the paper, and print the flower design onto the other side, positioned so the flower will be on the front. Write names on the front of the cards yourself, or send them to your calligrapher. Fold along the crease marks to create tented cards.