toki pona has 14 letters in its alphabet:
a e i k j l m n o p s t u w
the vowels are similar to spanish or japanese.
a [ä] - like a in father
e [e̞] - like e in let or ten
i [i] - like ee in bee
o [o̞] - like o in cone
u [u] - like oo in soon
(note that the comparisons to english words are approximations and may not be accurate depending on your accent, i recommend going by the IPA symbols for a more accurate idea of the correct pronounciations)
most of the consonants are just like english, except j, which is pronounced like y in english yellow.
don't be stressed, you don't have to pronounce the letters exactly as i say, you can pronounce things slightly differently if it feels natural - for example, you could soften your p, t, and k sounds into b, d, and g sounds!
oh and also, you always have to stress the first syllable of every word.
try to pronounce these words. they should feel familiar to you.
should sound like lookin'
should sound like money
should sound like tempo
should sound like yellow
should sound like moo
should sound like one