Hi there,
I'm don't know if this is the right part of Mumsnet to post it but I feel ye're probably the right people to advise me on this but here goes (and sorry about the length and detail of it and I know that ye'll all probably be advising me against going into teaching at the moment !); 
I am Irish and have lived in Ireland all my life and have always gone to school here (have been in normal state schools so have done the Junior Certificate and will be doing the Leaving Certificate- which is the usual end of school exams here- in June 2018). In school I am currently doing English, maths, Irish, French, biology, home economic and geography.
However,for various reasons, for a while now I've been hoping to live in some part of the UK, preferably England in the future, ideally from university onwards (hopefully I'll be starting university in September 2018) so that's where my questions come in.
I am thinking of either being a teacher (most likely primary,but if I was to do secondary it would probably be home economics, biology, childcare or geography that I'd want to teach) or else maybe working with children in a preschool/childcare setting.
So I'm wondering the following about studying and qualifying in these areas;
If I wanted to train to be a primary teacher/childcare worker in England, what is the easiest way to do it straight after school, how long would it take and how much would it cost?
If I wanted to train to be a primary teacher/childcare worker in Northern Ireland, what is the easiest way to do it straight after school, would I have to teach/study Irish, how long would it take and how much would it cost?
If I wanted to train to be a primary teacher/childcare worker in Scotland, what is the easiest way to do it straight after school, would I have to teach/study Gaelic, how long would it take and how much would it cost?
If I wanted to train to be a primary teacher/childcare worker in Wales, what is the easiest way to do it straight after school, would I have to teach/study Welsh, how long would it take and how much would it cost?
If I trained in one country of the United Kingdom
and then wanted to work in another country in the United Kingdom, could I go straight into work and if not how long would it take to retrain and how much would it cost?
If I ended up having to train as a teacher/ childcare worker in the Republic of Ireland and still wanted to then move to and work in the UK, would I be able to go straight into a job or would I have to retrain and requalify and if so how long would that take and how much would it cost?
So what I'm basically wondering is what is the easiest way to become a teacher or childcare worker in the UK straight after finishing school and that if I train in one part of the United Kingdom or Ireland and want to work in another part of the UK, will I be able to go straight into a job without extra training and if not what's the quickest and easiest way to retrain?
Sorry for this lengthy message but I'm heading into my last year of school next week and need to start sorting out what I might do after school next year and what's the quickest, easiest and most cost effective way of training after school that will easily allow me to live and work between Ireland and the various parts of the UK. I am able to get a British passport if that would make anything easier for me.
Sorry again for the lengthy message and I look forward to hearing from ye with yer advice. I did read stuff on how to become a teacher in the UK but I was finding it confusing, especially for someone who's looking to do teaching straight after school.
Thanks in advance! 