Firstly, good luck with your venture, if this is your dream, then go for it and if you are as committed as you say, I think you can make it work.
To keep people interested in coming to your shop, always try to get new, fresh stock in, I hate it with shops where they just have the same old stock every single time you go there,
it's virtually the same old stock every time, even a few years later, they still have the same stuff.
In January, have a half price sale, get rid of all the old stock. Be prepared by keeping a few bits aside every so often from collections bought in, to have a big revitalisation of lots of new stuff come February, the stuff that does not sell in your half price sale, don't just put it back up to full price again, just mark it down and keep it down at whatever the half price is, turn it over.
Try to have a good supply of new stuff in November, ready for Christmas time, have busts, statues, vintage toys like star wars etc
Keep the shop clean and tidy, to many times do I see dirty dusty shelves for new stuff.
Do a table at the odd show near by, few boxes, just so all the people travelling to the show can find out about your shop and hopefully drop in and spend a few pennies.
Create loyalty cards, be friendly with customers, know your product, good graphic novel section for people who just want to read and dropping in on the off chance because they like the films.
Definitely have a basic ebay shop with some of your prized merchandise, this should encourage people to come to your shop if not to far or maybe phone with enquiries to see if there's anything on their wants lists.
Have small events, signings, etc Change most of your wall stock weekly, I go in a lot of shops and they have the same stuff on the wall from years ago, lol, someone might be caught in by a cover they never knew about.
Be fair with prices, buying in, and selling, $1 boxes will do good, but again need to be filled with new stock on a regular basis.
Best of luck ;-) with it, hope it does well, herc