Why is it "mand" and not "manden?"
Mand=man, manden=the man, en mand=a man
Is there certain pronunciation rules that the danish alphabet follows ... it is very hard ti understand the google translate
Well, the danish alphabet sounds a little different that English, but you should look every letter up to hear what they sound like.
En mand, but et aeble... Does this mean use 'et' when followed by a vowel? And 'en' when followed by a consonant? Like english 'a' and 'an'?
No, there's not really a rule about 'en' and 'et'. It could be: 'Et hus, et gardin, et skab, et æble, et hæfte', and so on. Or it could be: 'en kat, en bog, en seng, en dør, en gulerod, en and' and so on. So no, there's not really a rule.