Originally Posted by chaika
Androvsky - If I were you, I'd stick to doing exercises in a textbook, where the exercises would focus on topics just covered. Doing what you just did leaves you open to implanting incorrect structures -- please forget you ever heard of "датал", which I don't think even exists as a Russian word (but I'm sure we will hear about it from the cogniscenti if it does !).
I would recommend a textbook/workbook/tape set, such as Голоса or Начало, commonly used in US schools.
Man мужчина is unusual in that it a male human is represented by a feminine-declined noun. The accusative (I see THE MAN) is я вижу мужчину. Ordinarily masculine animate beings end in a consonant and follow the masculine declension pattern, which would make the accusative the same as the genitive. For example, using человек, which is another word for man (more like "person"), you would say Я вижу человека.
Two things you have to learn about Russian -- declension of nouns and adjectives, and conjugation of verbs. Much more difficult that in English.