good advice, AT. While 1.5-1.8KG kits can be okay, you will want to nudge customers to the 3KG no sugar kits where they can expect great results. You might even throw in a packet a proper yeast as a opening special as kit yeast may be past it's prime. Also, stock [b:2n0x2tp7]brewing sugar[/b:2n0x2tp7] (get rid of the household stuff, that's embarassing) which customers can use with budget kits and everyone needs for priming before bottle conditioning.
Just a marketing idea for you, get the student population excited. Get some fliers, contact the student council at the largest college (I don't know what college's there are in Athlone), and offer to partially fund a student group and help them brew some great beer collectively. Would generate a buzz that not all homebrew is a tin of syrup and sugar you drink in 5 days that tastes like crap and gives you a headache. Provide the foundations for a open-to-the-public local group which would create self perpetuating cycle of new membership and new customers. Also, good 3kg (no sugar addition) kits would be popular with beginners and probably have a decent margin.