For this sentence structure, you want "of."
I dream of {things}:
I dream of chocolate.
I dream of horses.
I dream of fancy clothes.
I dream of enormous bookshelves.
I dream of {doing something}:
I dream of dancing.
I dream of being the greatest star.
I dream of marrying a handsome man.
I dream of having a large house.
For the word "to," you would have to change the sentence:
It is my dream to ________.
It is my dream to dance.
It is my dream to be the greatest star.
It is my dream to marry a handsome man.
It is my dream to have a large house.
If you phrase it, "My biggest dream is," then you have more flexibility.
My biggest dream is dancing.
My biggest dream is to dance.
My biggest dream is being the greatest star.
My biggest dream is to be the greatest star.
My biggest dream is to become the greatest star.
My biggest dream is of marriage.
My biggest dream is to marry a handsome man.
My biggest dream is marrying a handsome man.
My biggest dream is of having a large house.
My biggest dream is to have a large house.

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