I thought you had a changeable marquee sign like the portable roadside signs with the flashing arrows. If you are able to rent one of these prior to your opening and your sign ordinance allows, then by all means do it.
I personally hate these portable signs but they are very effective ...especially for your circumstances. You can buy a new one for about $ 500.00 or a good used one for about half that. Or rent one for short term use. I'm on a busy somewhat rural highway and have one. I took the arrow off but left the flashing lights on the top on. It has proven to be quite effective and I try to use cute tasteful sayings which I often get customer's comments on.
I put my store name permanently on the top of both sides then skip a line and have 2 more lines for changing messages. Traffic coming and going gets exposed to the sign.
I would suggest having coffee, soda, cookies, etc. for the first week but hold off for a Grand Opening for a month or so if you have the budget to promote it right. Skip the cocktails except for yourself ...for medicinal purposes only, of course

. Start a mailing/email list as soon as you can even if you don't envision using it for some time.
At my old store I had a beautiful masonry one constructed, but it cost me almost $ 8000.00 and I just can't justify that in this location.
Go at it enthusiastically. It'll be a little rough to begin with but willpower and taking the bull by the horns will win over in the long run.
By the way, having a priest bless your new enterprise and premises never hurt anyone and I'm all for it. I didn't do that here when I opened, but always have a blessing when I move into a new home. Besides, priests have things framed too!

Some of my biggest clients are the University of Notre Dame and various local churches and other private religious colleges and universities.