A brewery license is around 200 quid. I spent the last 6 months researching the brewery business with two friends of mine with the hope of starting something. I've visited all of the major craft brewers and spoke to a number of distributors. The only conclusion I can come to is that it is very tough to get into this business. For example, I heard recently that Coors Lite has only just become profitable despite 10 years in the market. It's incredibly tough to market craft beer in Ireland,and that's providing you even get to produce any in the first place. There are a number of capital grants available to aid in set up but the market place in Ireland is hostile to emerging beers. It couldn't be more different than Britian where you could likely run a successful brewery producing cask ale alone.
Unless you have a couple of million stashed away the best way to go is contract brewing initially to establish brand identity and then setting up on your own. Also, if you have any sense you'll have to start with a reasonably accessible lager to get your brand established. Lager is 75% of the market and it's much easier to get Joe Public to try a different type of lager than the flavour packed robust porter you dream of presenting to the world.
I have great respect for the Galway Hooker guys who went with what they like rather than the public but it's a struggle and I couldn't pay my mortgage on their level of turnover, at any rate.