Well, the sound of English-Turkish course has some issues as the moderators say. This is a phonetic language, so if you ever face a dilemma about the voice, listen to your senses, it will probably come true :D And no, the first and the last "i" should have same sound, a sound like "he" in English.
There is a rule in Turkish if a word has "a, ı, o, u" in first syllable then other vowels in the rest of the word will be "a, ı, o, u" or if "e, i, ö, ü" in first syllable then rest will be "e, i, ö, ü". But this rule is not for every word. There are some irregularities to that rule. But that might help.