you have to pronounce all the vowels short style. ...
Well not for "o," which is pronounced long, as in "hope."
and the syllables come after the vowels. so U/KU/LE/LE (to make it uke related to stay in Uke Talk).
When ever there are two same vowels together, then there is always a glottlestop (not sure of spelling), which, I think is also called an okina (in Hawaiian). So, Hawaii is technically Hawai'i. Kaho'olawe. Ni'ihau.
The letter "w" is always pronounced as a "v."
When two vowels are next to each other, well, you just have to know the word, if you want to know if there is glottlestop/okina between them. Kai (meaning ocean, does not have any glottlestop/okina between the vowels). Kaua'i. Mau'i. Lana'i. I can't remember if it is O'ahu or 'Oahu.
Technically, there is also a Kakou (not sure of spelling), which draws out the sound of the vowel longer.
And, yes, as referred to above, there is no silent "e;" which always makes the short (i.e., "pet" dog) sound.