fwailku byug
Beag (said like: byug).
"Beag" is pronounced like "beg" with a short "e" sound, similar to the word "beg" in English. The "g" at the end is pronounced as in "go." It can also rhyme with "leg."
Scottish Gaelic: muc Irish Gaelic: muc
No.
Cailín beag sounds like "Colleen b-yug".
The 'd' would sound like the 'th' in 'then'; the 'u' would be like the sound in 'could'.
It means something like "you are my little baby girl" in Irish Gaelic, but isn't quite right. A better version might be "is tú m'iníon bheag". See the related link.
'ach' pronounced like okh with a gutteral sound.
If you would like to hear spoken Irish you could check out tg4.tv online television.
The Irish word Iúil would sound like 'oo-il'.
There are many very different US accents and there are also many very different Irish accents. They would be all very different, so would not sound like each other.
In Irish it would generally sound like 'llawd-yir'; In Scottish Gaelic it would sound like 'law-jir'.