Buying small caps to find the next Nvidia can be risky. 5 questions to answer before starting

Here's our Club Mailbag email investingclubmailbag@cnbc.com — so you send your questions directly to Jim Cramer and his team of analysts. We can't offer personal investing advice. We will only

consider more general questions about the investment process or stocks in the portfolio or related industries.

This week's question: How do I find those small companies that may grow into winners?  What criteria matter for small caps with little or no earnings and sales?  Again, thanks for all the insight. — Kevin