girl : pronounced as rhyming with hurl, curl, pearl,
he'll - pronounced as rhyming with heel (of a shoe), deal,feel,meal,peel,seal,wheel
she'll - as with "he'll" but with the "sh" sound instead of 'h'
they'll - firstly, say these words : fail, mail,nail,sail,tail
now say this word : dull. Now say it leaving off the "d" - ull
Now try putting the sounds together : theyull, but don't stress the "u" part too much, so that the sound is half way between "ull" and "ll"
we're : the closest I can suggest (and people will understand you) is if you rhyme this word with "wear" which rhythms with tear, pear, bear
we'll: rhythms with "he'll" as above.
Does this help? Please let me know.