Make sure to get some 500g bags of DME. Get light, dark and wheat at the very least and maybe extra light too.
Also get some 3kg and 500g bags of crushed grains such as marris otter pale, chocolate malt, black malt and perhaps crystal. You can start with these and see how you get on.
This will open you up to extract brewers and some all grain brewers if they need something quickly.
If you can eventually get 25kg sacks for a price like <!-- m --><a class="postlink" href="
www.thehomebrewcompany.ie/">
www.thehomebrewcompany.ie/ (€45 I think) then that would be great but wait and see how you do.
Get in hops and yeast, the list you showed me was good. If brewferm blanche and danstar munich were not on it then add it for wheat beers.
Oh and remember what I said about a fridge, the yeast should be kept cool to prolong life and hops should be frozen but if they are vacuum packed then they should be ok. A wine chiller will be good so customers can see the yeast.
A 5 gallon boiler would be handy also. Just get one or two and see how well they sell.
I am not sure how advanced your brewing is but there a re a couple of ICB brewers in Athlone and I live in Rochfortbridge so you are welcome at least to pop down to me and take a look at my equipment and I can show you anything you need to know
Oh one other thing you could look into is providing a co2 service where I could buy a co2 tank and when I need a refill I bring it in and take a full tank but only pay the cost of the refill. Same as calor gas bottles. No rush on that though, I think more people bottle than keg but I have a keg without gas so will be needing a supply myself at some point when I have sorted a dispensing system etc.