It depends on where you come from, but your insurance should cover you in the Republic of Ireland. Check your policy conditions.
i need a licence to run a pub poker league in the republic ireland?
unfortunately you do
You don't need a passport to travel between the UK and the Republic of Ireland.
No
The Republic of Ireland has a corresponding system known as an NCT. You will need an NCT after a set period. See details on the site below.
The Republic of Ireland does not have postcodes. You just use the address. That is all you need. If it is on an internet form looking for a postcode, then type in IE.
There are customs at Dublin airport. All non-European Union travellers must go through customs. If your journey was entirely within the EU, you can use the blue channel, where formal customs don't operate, after reclaiming your baggage. However customs officers will monitor this area and may operate checks. If you have something to declare to Customs you must do so. Customs officers are very vigilant and arrests are often made.
People should bring Euros to Ireland, as that is the currency that is used in the Republic of Ireland. If they are going to Northern Ireland too, then they will need Sterling to spend there.
depends where your coming from, see the related link.
yes, because the republic of ireland is a seperate country from the UK you will need a passport to go there.
Yes you do. Most insurance companys don't like you to have more then 4 horses.
That will depend on where you are coming from. At the very least you will need a passport. People from some countries require visas to enter Ireland. Check the site below for more details.