How ask out letters, not being a creep?

I want send out a letter to a person who I am feeling for, but I don't know if I should be straight forward with my thoughts or writing letter how I feel about her. I don't want be a creepy person, but I don't want to be awkward either. Is this line a thinking bad idea or a good plan. I don't know what to do. Be straight forward with a conversation or write a letter telling her what I am feeling?
Yes, write the letter
No, tell her in person.
Both bad.
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How ask out letters, not being a creep?
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