First of all congratulations! You will have fun!
(2) regarding the vendor license, I'd ask who ever invited you what things you need to know like this, as it varies from state to state and place to place.
(3) depending on where it is, or what it's for there may be a booth fee, or a % of sold fee. Be sure and ask a@ this before hand.
(4) you will probably need to bring your own tables / items for set up howevee if it's at a church or banquet hall sometimes they will provide the tables. If so ask if they charge for using them, some places do.
(5) use a solid. Lor table cloth for displaying your it's, as a solid color / print will distract from the colors of the items you have for sale.
(6) if you have a peg board piece you could use place hook on it to hang any item you could, bibs, bags, .....
(7) if you have a baby dool size crib/ rocker ...use this to displays the baby quilts in / on.
(8) condor taking orders if your interested in doing this. If so make some business cards (can be done off home computer without a program, very easy to do) then take a note book for I do.
(9) if a you code to make a custom item, get Atleast 12 of the payment BEFORE you start.
(10) if your interested in doing this take some samples of the fabric you have or know you can get more of
(11h most of all HAVE FUN!
Don't know if this was the kind of advice/suggestions you were looking for but I hope it helps you out!