much easier if you post the Irish as written, and tell us if there is a dot over any letter or a long mark over a vowel. The fadas aren't just really for emphasis, they do indeed change the pronunciation, just like long vowels in english are different from short.

BASIC pronunciation, discounting regional dialects, and not getting into the broad and slender characteristics are:

a - as u in up
á - as aw in maw
e - as e in bet
é - as ei in reign
i - as i in bit
í - as ee in feel
o - as u in up
ó - as o in go
u - as u in up
ú - as oo in boot

b - as in boy
c - as in cat, ALWAYS a hard c
d - as in door
f - as in fit
g - as in good
h - as in hat
l - as in luck
m - as in Mary
n - as in nut
p - as in Paul
r - as in rat
s - as in sam or sham depending on vowels
t - as in tip

dots over certain consonants cause lenition or softening (lenience)

bh - as v or w as in will or vwill
ch - as in German ach, a gutteral sound, as in chutzpah
dh - as in y in yell or silent, Gaelic was spelled Gaedhelic once
fh - silent
gh - as y
mh - v or w
ph - as f
sh - silent
th - silent

another consonant change is called eclipsis, always pronounce the first letter in the combination co

mb - as m
gc - as g
nd - as n
bhf - as v
bp - as b
dt - as d

hope this helps a bit, but give us the Irish, we'll help you pronounce it