Vowel parts that appear on the left of the consonant should be typed first, but all others should be typed after the consonant.
If you press Delete before (on the left of) a combined consonant and vowel, it will be erased completely, but if you press Backspace after a character, only the vowel part will be erased (even if you typed the vowel before the consonant). If you use the arrow keys to move through the text, you only need to press an arrow key once to move past each character. If this vowel is combined with a consonant, though, such as, the vowel part is typed with s after the consonant has been typed.
You should type the characters in the same order that they would be written on paper. If a special font is needed for this language, most computers will download it automatically.