In this edition of The Motley Fool's "Ask a Fool" series, Motley Fool One analyst Jason Moser and Motley Fool Stock Advisor analyst Brendan Mathews take a question from a reader who asks: "I am a brand-new investor in my mid-20s, and I have NO IDEA what to really look for when investing. What are the 5 most important things (according to you) to look for when picking a company to back with my money?"

Brendan suggests adopting a business owner's mind-set and lists his five key common-sense factors to consider, including circle of competence, management, business quality, earnings sustainability, and valuation. Jason weighs in to emphasize the importance of long-term holding and continually learning and improving your investment process. Both Jason and Brendan agree that starting to invest in your mid-20s is awesome!