Originally Posted by
iCake
Antonio, don't be so hard on yourself, you're on the right track there, actually you did very well.
Just a few notes:
Я заинтересован в опере - this sounds like you're interested in one particular opera play, whereas:
Меня интересует опера - sounds like you're just interested in opera as a form of art.
"Dear Aleksei, I think I found someone that might be interested in buying out / acquiring your company"
"Уважаемый Алексей, думаю, что нашел кое-кого, кто может быть заинтересован в покупке вашей компании"
That's the way to go, a few things to note though.
If you say уважаемый someone it's much better to refer to that someone with not only their first name, but also the patronymic/last name or the combination of all of those three. Anyway, usually it's first name + patronymic
Кое-кого - I used that one instead of кого-то because кое-кого implies that you know exactly who that someone is, whereas кого-то means that you only have a vague idea of who the someone is. Nevertheless you can replace any of those two with человек there - "... нашел человека, который..."
Take care.