Short answers, pulled from the story.
Ireland made their international debut on the 18th of February 1882 against England at Bloomfield Park in Belfast. The match ended with a scoreline of 0, 13 marking the record win for England and the record defeat for an Ireland team.
Samuel Johnston appeared as the youngest international debutant ever recorded until 1908 when he took the field at just 15 years and 154 days old. He also scored Ireland's first goal three weeks later against Wales becoming the youngest ever international goalscorer.
Billy Crone took charge of the Ireland team for the first time on the 20th of February 1897 marking the first instance in history where a national team had a dedicated coach. This established a new administrative structure for international play despite ending in a 6, 0 loss to England.
Ireland won the 1913, 14 British Home Championship outright claiming the title following a 1, 1 home draw with Scotland. They defeated England 3, 0 at Ayresome Park in Middlesbrough and beat Wales 2, 1 away from home during this campaign.
A rival association emerged in Dublin in 1921 after Southern Ireland gained independence as the Irish Free State leading to the formation of the Football Association of Ireland. Both teams competed under the name Ireland until 1949 when they participated together in qualifying tournaments for the 1950 World Cup.