Resources: Modern Chinese -> Classical Chinese (Dictionary/References/etc.)
Well actually we also use "我" in classical Chinese.
For example: 《曹刿论战》：“齐师伐我。”
And as for 汝, it is not equivalent to 你/您.
Sometimes 君 is also used to refer to 你/您.
Therefore it's very hard to find such a dictionary that convert everything to classical Chinese and even if it exists it may not be correct.( And I guess there is no such a dictionary.)
You may try to read more classical Chinese articles to get familiar with the way people write or simply ask a Chinese to translate for you. There is no standard way of translation. It depends on how you manage your sentence in classical Chinese.
The most simple way is to find a sentence expressing the same thing as what you would like to say and pick out the words you want.
Even Chinese people study classical Chinese by reciting the passages first,so referencing to an existing passage is very important. Hope this can help you.