Because we use Wikipedia as our standard for Notables, the initial question always is whether or not he's currently on Wikipedia. If he is not, then it get complicated. Note that there are a few exceptions to this (like those listed in the National dictionaries of biographies, for example).
So if you want to qualify someone for Notables, you essentially have to qualify them for Wikipedia. This doesn't mean you have to submit them to Wikipedia and have a page built before you can qualify them for Notables, but you have to go through a similar process. This means outlining why they are Notable, laying out the proof behind their notability, and demonstrating why they stand above others in their field, or their peers, or others who have done similar things. Generally, Notables members will respond as to whether they agree or disagree as to whether the individual meets (or exceeds) the standards for notability, or needs further research before a decision can be made.
If you document the profile with the appropriate information, it's generally easier as the information is then all in one place for a discussion to be held. Let me know if you have questions.