Is It a Good Idea to Start a Company?

This year i started a company. I developed the brand, create od the products and tested them over and over again. People loved it, and i was able to partner with a very good company. With this company, i have the ability to make to have a resounding effect for marketing. But i do not have the capital to make much product. This led me to find an investor who is willing to give me the capital i need to launch. Some are saying that i should start small and not bring some one else in. So you can kind of imagine his question: Should i a deal with the investor, or try to grow it by myself when i don't have enough money to