Are you doing this all yourself? Do you have a parent or mentor doing this with you? If so, they will probably be able to give you a good answer.
First of all, though, figure out what you want. Correction, what you NEED. The only way to figure that out is to figure yourself out and what you want out of life. A mentor can help there as well.
One of the great things about shidduch resumes, however much people may hate them, is that they really minimize on the amount of time it takes to research someone. For instance, if you wanted to know something simple like what school someone went to, you’d have to call people. Now, it’s on a piece of paper. So you really just call to get a real feel about the person from people who actually know her.