No
yes, they need
Yes, they need one.
Yes
yep
Slovakia is in EU and therefore you don't need tourist visa if you are Irish cityzen.
Yes sure
Yup
Yes, you may need a visa to travel to Ireland depending on your nationality. It is recommended to check with the Irish embassy or consulate in your country to determine if you need a visa for your trip.
yes, you can. i you have a valid romanian visa, you can stay 5 days in bulgaria if your way is to romania
NO.
no