Parlox wrote:Pronounced (I can't use the IPA for a couple of the character's in my language, because for what i know the IPA does not have symbols for diphthongs)
Diphthongs are just sequences of two vowels, so diphthongs are represented in the IPA with the letters for the monophthongs that make them up, e.g. [ai] or [au]. If you want to make it clear that they're diphthongs and not sequences of two syllabic vowels, you can use the non-syllabic diacritic under the non-syllabic vowel, e.g. [ai̯] or [au̯].
Parlox wrote:Ao as in american english Ow. Ai as in american english n(I)ght. ae as in american english l(A)te.
[ae] sounds like the "i" in "bide" (as does [ai], although the two aren't the same; I'm not using "night" because it has a different vowel for me). The American English "ow" sound in "how" is usually written as /æʊ̯/ (or /aʊ̯/, but that's more British), the "i" in "bide" is usually written as /aɪ̯/, and the the "a" in "late" is usually written /eɪ̯/ or /ɛɪ̯/. [ao̯], [ai̯], and [ae̯] don't exist in most varieties of English, but they sound very similar to [aʊ̯], [aɪ̯], and [aɪ̯], respectively.
The American English diphthongs, however, are somewhat uncommon among the world's languages. The more common equivalents of the sounds you want would be /au̯/, /ai̯/, and either /ei̯/ or /e/. /ao̯/ also works for the first one, but it's much less common.